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Hardware

NAND Flash Better Than DRAM For PC Performance 205

Posted by Soulskill from the drams-do-better-for-memory-loss dept.
Lucas123 writes "Adding NAND flash memory to a PC does more for performance than DRAM and costs less, according to a new study. As the price difference between the two memory types widens, NAND flash will become the memory of choice in the PC. The effects of NAND flash adoption are already being felt in the DRAM market, as revenue in 2011 is expected to decline 11.8%."
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NAND Flash Better Than DRAM For PC Performance More

NAND Flash Better Than DRAM For PC Performance

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  • One Problem (Score:5, Informative)

    by rhook ( 943951 ) on Wednesday July 20, 2011 @01:26AM (#36819892)

    NAND flash degrades over time and has a limited amount of program/erase cycles.

    • Comment removed (Score:5, Informative)

      by account_deleted ( 4530225 ) on Wednesday July 20, 2011 @03:23AM (#36820480)
      Comment removed based on user account deletion

      • Re: (Score:2)

        by IICV ( 652597 )

        You're very much a question talker, aren't you?

        And anyway, the reason why you would use NAND as RAM instead of the current DRAM if they could work out the kinks is because NAND doesn't need power to maintain state. This means that you could be doing something on your computer, kill the power without any sort of warning at all, and then plug it in later and resume exactly where you were before. It would lead to, for instance, near-zero battery usage sleep in mobile devices; they would be able to almost shut

        • Re: (Score:2)

          by Khyber ( 864651 )

          "NAND doesn't need power to maintain state"

          Electron leakage as you go lower in fab scale processes pretty much ensures that your statement is false.. This is why we're trying to move to OUM/OVM phase-change memory instead.

        • No, that really wouldn't work. Every "sleep" system I'm aware of doesn't work like that and can't. Before "sleeping", the system must put various devices into particular states and then, before waking, bring them back into the appropriate state. Think network connections, wireless, etc, etc.

      • Re:One Problem (Score:5, Insightful)

        by daid303 ( 843777 ) on Wednesday July 20, 2011 @04:29AM (#36820728)

        I work with flash daily, we make products that last 15 years with flash. Without large failure rates. The problem is not with flash. It's with the SSD implementation. It's the "let's replace harddisks with flash! and don't change anything else!" that causes problems. Because of this normal filesystems are used, that assume to be on spinning harddrives, which have no issue in writing the same sector twice, or just writing 1 sector at once. On flash on the other hand you need to do wear-leveling, and have large erase blocks. Both are handled on the SSD right now, and that's where it fucks up. It needs to maintain an internal mapping of all the flash, accounting for wear-level and shifting blocks around. One error in this internal management and your disk is junk. Even with your fancy journaling filesystem (ntfs/ext3,4/...) you are just 1 power failure away from losing your data.

        Compact flash cards, SD cards, SSD, USB sticks all see this problem. So far we've only found a few suppliers of Compact flash cards which guarantee the internal management is safe, and we tested it and found it to be true. SD cards, I've a few broken "industrial grade" SD cards on my desk as proof that this is not the case. SSD is to large for our product, so I have no tests for these, but I expect the problem to be the same.

        We use raw flash, with linux and JFFS2 or UBIFS. Which is a filesystem designed to run on flash, raw flash. Wake me when "SSD" offers that solution.
        (TRIM is not a sollution, it's a workaround)

        • Re:One Problem (Score:5, Interesting)

          by Anonymous Coward on Wednesday July 20, 2011 @06:44AM (#36821236)

          Compact flash cards, SD cards, SSD, USB sticks all see this problem. So far we've only found a few suppliers of Compact flash cards which guarantee the internal management is safe, and we tested it and found it to be true. SD cards, I've a few broken "industrial grade" SD cards on my desk as proof that this is not the case. SSD is to large for our product, so I have no tests for these, but I expect the problem to be the same.

          If you expect SSDs to have exactly the same problems as SD cards, you're a total moron with at best shallow expertise in the field. Go look up the specs of controller ICs used in SSDs and try to tell me with a straight face that they're exactly the same thing you'd get in a SD card, or even a very good CF card.

          To pick just one example, do you know of any CF cards which compress all data on the fly in order to increase effective flash lifespan by reducing the total amount of data written? (Since the SSD controllers in question use hardware compression engines which can handle hundreds of megabytes per second throughput, this also has the nice side effect of increasing effective performance, unless you're storing incompressible data.)

          We use raw flash, with linux and JFFS2 or UBIFS. Which is a filesystem designed to run on flash, raw flash. Wake me when "SSD" offers that solution.

          Whatever makes you think the FTL (flash translation layer) firmware inside SSDs isn't designed to run on flash, raw flash? Whatever makes you think that a generic one-size-fits-all software solution like JFFS2 applied to whatever random flash memory you put in your embedded system is better than a SSD whose firmware has been tuned for the specific flash chips it was built with? (One of the fun things about NAND flash is that it's far from generic, especially MLC, and even more especially sub-30nm MLC NAND.)

          More broadly, JFFS2 is one way to skin the cat, having a "drive" abstract flash into a generic block device is another. If you want low cost, low-to-medium performance, and probably not the best possible reliability, especially for heavy write loads, JFFS2 and friends will do just fine. If you want a real HDD replacement for non-embedded-systems, it's not even close to being the right solution. Which is why you don't see anybody trying to deploy flash-managing filesystems as HDD replacements.

          The controllers used in real SSDs are expensive enough that it would be a huge win if you could toss them and just use a flash FS. There are lots of very good reasons why this has not happened and will not happen. Take your head out of your butt and get some perspective, right now you're a classic example of how a little knowledge is a dangerous thing.

          (TRIM is not a sollution, it's a workaround)

          No, TRIM is an attempt to improve performance which has been oversold a bit in the popular computer press.

          • Re: (Score:2)

            by TheLink ( 130905 )

            To pick just one example, do you know of any CF cards which compress all data on the fly in order to increase effective flash lifespan by reducing the total amount of data written?

            You shouldn't be calling people morons "with shallow expertise", because if you actually understand how and why things break you would realize that your remark actually supports his point: which is all that fancy stuff makes it more likely for you to lose data.

            Or worse, lose data without realizing it, see this: http://www.dslreports.com/forum/r25491097-Dell-Laptop-and-SSD-Time-warp-issue [dslreports.com]

            http://forum.notebookreview.com/alienware-m17x/552728-fresh-os-install-ocz-ssd-r3.html [notebookreview.com]
            To quote:

            any firmware before 1.29 can result in you experiencing what OCZ refers to as "Time Warp" (you lose all info stored on drive since last boot - happens at random). 1.29 decreases likelihood of this happening, but does not eliminate the possibility.

            If you don't notice that th

        • Re: (Score:2)

          by Ant P. ( 974313 )

          Because of this normal filesystems are used, that assume to be on spinning harddrives

          Worse still are cheap-ass SSDs that assume "normal" filesystems are being used, and corrupt your data if you aren't using windows [seagate.com].

        • Re:One Problem (Score:4, Interesting)

          by Yvan256 ( 722131 ) on Wednesday July 20, 2011 @08:12AM (#36821764) Homepage Journal

          Care to tell us which flash storage cards (brand, capacity, name, etc) you tested which have safe internal management?

      • No kidding (Score:4, Interesting)

        by Sycraft-fu ( 314770 ) on Wednesday July 20, 2011 @04:59AM (#36820828)

        It is far, FAR more important for your computer to have enough RAM than to replace a HDD with an SSD. At this point (and probably for a long time) flash is not replacing DRAM. You need to have RAM in your system for it to work. Flash replaces hard disks.

        Well cool, HDDs are by far the slowest component these days. SSDs are have somewhere in the range of 2-5x the transfer rate they do and more importantly are an order of magnitude or more faster on access.

        Well that still is no comparison to DRAM. DDR3 is 40x the transfer rate of even fast SSDs and about 4-5 orders of magnitude less access time. So you can't just have flash, at least not if you want a nice n' fast CPU.

        Now in terms of practical usage I find RAM is way, WAY more important. If you don't have enough, some programs will just flat out not run. If your system is starved, paging kills the performance, even with an SSD handling the paging. Knocking in a good amount of RAM is the #1 thing you can do to keep your system running well and it is damn cheap.

        SSDs improve responsiveness, don't get me wrong. I love mine and I'm happy to have them (though to be fair I wasn't willing to get them until I saw some on sale for $200 for 256GB). However it is a more minor improvement than having a system with plenty of RAM or a good CPU. I do notice some slowness to my non-SSD work system, but not much.

        The other problem is even though flash is cheaper per GB ($2ish per GB as opposed to more like $9ish for DRAM) you need more disk space than memory. My laptop has what I consider a reasonable amount of both, that is 4GB of RAM and 256GB of SSD. My desktop has a ton of RAM, 16GB, and a moderate amount of SSD, 512GB. So the SSDs cost me a hell of a lot more, despite their lower per unit cost. I could easily recommend a 4GB or more RAM upgrade to anyone, I couldn't recommend an SSD big enough to hold a good amount of stuff.

        Pretty much I only recommend SSDs if you've already maxed out your RAM. Spend your money on that first, then if you are still willing to bear the cost of an SSD, go ahead.

        In that vein, I noticed more improvement on my laptop than on my desktop. No small part of that is likely the RAM. The desktop has RAM to spare, it can cache a ton of stuff. The laptop is not starved for RAM, but not does it have a massive surplus. The base usage on the system is about 1.5GB for OS and background services. Gives it maybe 2.5GB for caching when nothing else is running. Hence the SSD helps more.

        • Now in terms of practical usage I find RAM is way, WAY more important. If you don't have enough, some programs will just flat out not run. If your system is starved, paging kills the performance, even with an SSD handling the paging.

          I think the idea is that with the faster access times of an SSD, the operating system will be able to evict things from the system's cache more quickly, leaving more RAM for applications to use.

          about 1.5GB for OS and background services.

          This is part of the problem. Handheld devices are still RAM-starved, which is why handheld devices run a different incompatible operating system. But small laptops are also RAM-starved, and they run a desktop OS for the sake of user familiarity despite having only 1 GB (source: Dell.com).

      • 3 or 4 GB of RAM on new systems? Seriously, why would you create a new system without being fully 64 bit and a minimum of 8mb of RAM, preferably in two slots with two more open? Not knocking your logic, just your implementation. History has shown this old man that RAM requirements go up faster than Moore's Law. 4GB of RAM is too low with Win7 aggressive caching, which is one of the very few advantages of it. Even the file servers (Linux) are using 24GB of ram so they can cache everything, and they were

      • Re:One Problem (Score:4, Informative)

        by xouumalperxe ( 815707 ) on Wednesday July 20, 2011 @08:12AM (#36821762)

        Not to mention what TFA neglects is the simple fact that one doesn't need as much memory as they do storage space so comparing the two? More than a little pointless.

        My interpretation of the article is as follows: In any given workload, you're likely to have a mixture of memory operations and disk operations. If, instead of putting all your money on RAM that will speed up your memory operations, you put part of it into an SSD that will speed up your disk operations, the overall performance for that workload will be better. Prefetching programs doesn't do nearly enough if the workload involves more disk activity than just loading the code.

        Not sure I agree with the article, but the point is a lot better than you were making out to be.

    • In practice it won't matter. I calculated my 60gb SSD would have a lifespan of eight years based on it's current use over 6 months. Well before then 60gb won't be a useful size, and it would be bested in both price and performance by a $20 bargain bin 2 terabyte USB stick in 2019. It's more likely the RoHS compliant crap the controller board is soldered up with these days will fail long before the NAND chips actually begin to eat itself. Considering many gadgets these days have a 2-3 year design life (OTTOM
      • I've yet to see a ROHS fail and I've got stuff that's ROHS compliant from ages ago ... my TV is from the early 90s and is a bubble tube, and all silver-tin.

    • Re: (Score:2)

      by jon3k ( 691256 )
      Which is relevant absolutely, but what if that's far longer than the expected life (or warranty) of the hardware it's in? Consumer laptops last what, maybe 3-5 years? 99% of consumers will never wear out MLC NAND in 3-5 years of normal, or even high, use of a laptop. So it's largely moot. I've been using SSDs for years now and I'm still waiting for all these problems the harbingers of doom have been espousing on slashdot the entire time. And I have some really early (first generation vertex) drives and
  • Last time I checked, DRAM was still an order of magnitude faster than NAND flash, so swapping out your memory for flash storage would seem to be insane to me. At first I thought it was going to be how replacing a spinning disk with a flash drive is a much more noticeable upgrade than going from 4GB to 8GB of memory, but the article seems to suggest that because the market dipped a bit, DRAM is going to die out entirely and we'll be using only NAND flash for all memory on the system.

    There would have to b

    • You're missing the point:

      After reviewing a "wide range of DRAM and NAND configurations," as well as nearly 300 industry-standard PC benchmarks, the researchers concluded that even at today's prices, a dollar's worth of NAND flash improves PC performance more than adding a dollar's worth of DRAM.

      Nobody is talking about what's faster or cheaper. They're comparing apples and oranges -- and telling you which to buy.

      • Re: (Score:3)

        by afidel ( 530433 )
        Well, I guess that's true to a point. For instance for my Oracle BI database server we put as many 8GB DIMM's as would fit into the system (at full speed) and the next biggest bang for the buck was using a 640GB MLC flash card from FusionIO, the card cost about as much as swapping the DIMM's for 16GB units but provided significantly more performance improvement than adding another 96GB of ram would have. Now if you told me to put 4 or 8GB of ram in the box and add flash I would laugh at you.
        • You could have used a battery-backed RAM IDE drive (slots into the PCI slot, contains RAM and a battery), but that's only really a good idea for temp space, and most databases won't fully-journal to a separate temporary space. It's a pity, because doing 32 or 64GB on RAM would be a huge performance boost, but way too much to keep in risk of data loss.
      • No, they're rebutting the conventional wisdom that the most cost effective way to speed up a PC is by adding more RAM. According to their (unspecified) benchmarks, you get better bang for the buck using NAND to relieve pressure on the hard disk (since they're inherently horribly slow).

        Here's the crux:

        "A well-designed NAND/DRAM combination brings SSD-like performance to a system at little or no price increase over a standard system based on the conventional DRAM-plus-HDD platform."

        Obviously this is moot

        • Comment removed based on user account deletion

          • 4-8Gb of RAM will allow the OS to prefetch pretty much everything you use on a daily basis and then some, while 4-8Gb of NAND

            The first of these is only true in theory. You may only access 4-8GB of data per day, but predicting which 4-8GB that will be is hard. Operating systems get the low hanging fruit, but the difference in performance from disk caching hits diminishing returns after about 1GB. With 8GB, you're likely to have memory free, because the OS can't make good decisions about what to cache.

            The second half is completely missing the point made in the summary. 8GB of RAM may give more of a performance increase than

            • and 64GB of flash makes a much bigger difference to performance than 8GB of RAM.

              except it doesn't. That's like saying 2TB of 5.25 Floppies make a bigger difference to performance than an 8MB HDD. Bigger storage space does not equal faster speed.

              • except it doesn't.

                Yes it does, that's the entire point of the conclusion of the study in TFA. Beyond a certain point, RAM only makes your computer faster because it's being used as disk cache. Cache quickly hits diminishing returns, and beyond that point making the persistent storage faster is a more noticeable improvement. If you can add a big enough flash drive that almost everything the user ever touches will be in flash, then this gives a much bigger improvement than a small increase in cache. A few disk cache misses

      • Cutting off your own foot with an axe and cauterizing the wound is more cost effective than going to a doctor and having your diabetes treated for 30 years. Guess which one I'm picking.

    • I suspect that what they're talking about is the effect of caching data from your disk drives in Flash instead of DRAM, and also letting you swap data out of DRAM into Flash instead of disk. Flash is cheap enough that for typical applications, you can cache most of your active data there, not having to wait for rotating machinery.

      Windows 7 is supposed to have some feature that manages this in an intelligent way - so you can speed up your machine for a year or so by adding a $10-20 memory stick. (I'm no

      • "Windows 7 is supposed to have some feature that manages this in an intelligent way - so you can speed up your machine for a year or so by adding a $10-20 memory stick. (I'm not running Win7, so I haven't tried it - but my laptop has an SD card slot, which would let me leave a card in there full time, without it sticking out like a USB stick.)"

        I've tried it on multiple systems, with fast USB sticks - Superfetch is much faster and more efficient. Only problem there: Many of the current generation (Sandy Brid

  • The article gives zero useful information and a link where you can buy the actual study. What was the pricing used for the comparison of $1 dram versus $1 nand? Surely this is OS dependent as well.

    • Does this take into account the user software profile? Somehow I doubt that trading NAND for DRAM will give you muct help when you are running a lot of CGI rendering or PhotoShop code. Maybe there would be a benefit if you are just running a browser, but even that sounds a bit off base to me.

      Who do they expect to buy this study? It has a rotten order about it...

      • Re: (Score:2)

        by yacc143 ( 975862 )

        Well, it's obvious, that Flash is superior swap:

        -) it's random access. The huge impact of seeking (measured in ms) is gone.
        -) it's relatively fast at reading/writing too, compared to normal hdd.

        So yes, it's obvious that adding flash for swap makes sense.

        Now if flash-swap can substitute RAM depends naturally a little bit on the workload.

        But 2x4GB DIMMs cost your around 44€ here around. A small SSD in 230-270MB/s range costs 62€ for 32GB.

        So you get about 2.8x as much "capacity" for SSD compared to R

    • FTA :

      After reviewing a "wide range of DRAM and NAND configurations," as well as nearly 300 industry-standard PC benchmarks, the researchers concluded that even at today's prices, a dollar's worth of NAND flash improves PC performance more than adding a dollar's worth of DRAM.

      How in hell's name do they conclude this? Do they extrapolate from zero or something? I mean, if your machine starts out with say, 2-4GB of RAM, which is usually enough for running most of your applications (minus cache), what do you think is gonna make more of a difference? Adding RAM will just cause the OS to cache more, so you're just limited by HDD-DRAM speed. On the other hand, if you stick a NAND in there, you'll still be caching but at the speed of NAND-DRAM, which is considerably faster, plus

      • Re: (Score:2)

        by yacc143 ( 975862 )

        Okay, have anyone here experienced flash wear out? Hmmm, no hands raised. Performance issues with modern OS and modern (as in last year introduced stuff) SSD? No hands again.

        It's absolutely correct, that flash can wear out. Flash as in flash memory cells. Modern SSDs have quite a bit of controller logic to handle this. Plus replacement blocks. So yes, if you use it extremely intensively, e.g. as swap, SSD may (or not) give up after 2 years or so. Hint: I'm used to swapping hdds once per year, to avoid data

        • Re: (Score:2)

          by Khyber ( 864651 )

          "Okay, have anyone here experienced flash wear out? Hmmm, no hands raised."

          That's because you answered yourself without letting anyone speak up, you fucking moron.

          I've had multiple flash types fail miserably on me.

          Consider this a big raised hand plus a slap to your ignorant mouth.

      • Re: (Score:2)

        by gmack ( 197796 )

        Caching more is pointless since it only caches when you load things the first time. Adding a 32 GB SSD as an OS drive did more to accelerate my system than going from 4 GB to 8 GB RAM did. For desktop use where each app load will pull in a ton of libraries from all over the drive it is ideal and at my usage pattern it will be a good 10 years before I even start to see the drive wear out.

        Details: 8 GB RAM, 32 GB SSD for OS and applications, 1 TB for data.

  • Comment removed (Score:3)

    by account_deleted ( 4530225 ) on Wednesday July 20, 2011 @01:30AM (#36819920)
    Comment removed based on user account deletion

    • wasn't that the potential for memristor technology if that ever pans out? Except its storage, RAM and logic?

    • Basically, TFA is saying that it will be awhile before we go back to a unified cache that's both RAM and storage (like core memory).

      Actually, core memory was used exactly as RAM and not as storage, even though it did have data retention capability (obviously, as it was based on ferromagnetic effects). The actual storage was done on mechanical devices. Heck, back in those days, you had some fast rotating drums with lots of reading heads - a hard drive of sorts, except that it had fast data access and throughput, but limited capacity. Even this, seemingly hard-drive-like device, was used as RAM only.

  • Correlation is not causation (Score:3)

    by scdeimos ( 632778 ) on Wednesday July 20, 2011 @01:50AM (#36820062)

    The effects of NAND flash adoption are already being felt in the DRAM market, as revenue in 2011 is expected to decline 11.8%.

    The former is not the cause of the latter. The rise of mobile devices with less DRAM in them is more likely to blame: less people are buying new PCs and Laptops when their phones and/or tablets can do everything they need.

    • The rise of mobile devices with less DRAM in them is more likely to blame: less people are buying new PCs and Laptops when their phones and/or tablets can do everything they need.

      The more likely theory is that computers continue to live longer and have reached the point of "good enough" that end users do not feel compelled to replace a working, 6 year old computer.

  • A bit confusing (Score:4, Insightful)

    by m.dillon ( 147925 ) on Wednesday July 20, 2011 @02:05AM (#36820118) Homepage

    I think all they mean is that dram isn't really all that cost effective as a data cache. For data that one intends to export out the network. Storing that data on a SSD, assuming it's a relatively static data set (which most is), uses far less power and costs less than purchasing an equivalent amount of DRAM (and the much larger mobo required to hold that DRAM). The access times are plenty fast enough to still saturate the network. That's all. Not rocket science.

    This has been known for several years. Replicate a small server with 8-16G of ram + a 160G SSD + a 2TB HDD sits right on the sweet spot. In fact, even 4G of ram would probably be fine. The idea is not to replace your hard drive but instead to insert another layer of cheap caching to avoid having to maintain a complex, expensive, power hungry HDD storage system just to get better throughput.

    -Matt

  • Is the assertion really hybrid hard disks and turbo memory are having a noticable negative effect on the DRAM market?

    Trying to imply a relationship between two markets by realitive growth is especially rediculous considering explosion of the smart phone market which relies entirely on flash.

    The only thing more rediculous about TFA is the idea NAND is in any way a suitable replacement for DRAM.

  • I see this article as being myopically focused upon "main memory in portable end-user devices."

    DRAM is going to stay vital for at least the server market, and I would guess the desktop market too (for as long as desktops last). Your iPad 3, maybe they have a point, but server apps would work current NAND into an early grave. The cost savings would be greatly offset by the service outages.

    And since "the Cloud" is the new big thing, that means that DRAM is going to be around for a while. I don't see how the m

  • If SSDs appear and DRAM goes down it could aso be that there are now more subnotebooks or ultraportibles in which DRAM is a power consumer and HDs are too big? It could be that MS, under the pressure of the first netbook wave which contained linux has shown reason and put out Windows 7 in opions which allow to run it on normal machines. I mean. Just thinking.

    I personally dont see Flash replacing DRAM soon. I see that DRAM memories stop to grow for other reasons.

    Let me say it that way round: i see that my PC

  • It would be a couple GB of flash that is accessible to the OS as a block device. Then, let the OS use it for paging and for caching of frequently access files or blocks.

    There should be a branding campaign so that consumers know that it is extra memory that will speed up their machine. Call it something like "turbo memory."

  • I'm assuming MS is keeping an SSD version of ReadyBoost as a Windows 8 "new feature". This should offer a very good price/performance ratio.

    • I think there's a limit to how big your readyboost cache canbe before it starts to degrade performance - if you're reading all the time, then it's fine, but when you start to write you have to write to both your SSD and the backing store or invalidate the cached data you've just modified.

      Besides, a USB flash drive comes in sizes up to 128Gb, and they're a lot cheaper than SSDs. If you have a SSD, install it as a drive!

      • I was thinking, indeed, of a very small SSD delivering most of the performance of a full-size one, at a fraction of the cost. Something along the lines of 80% of the performance for 20% of the size, and cost.

        I'm trying out USB3 readyboost, 7 seems to grab 4GB max.

  • The right balance of NAND, DRAM and an HDD yields better results than DRAM and HDDs, study finds

    So.. they have NAND, DRAM and HDDs, and they choose to kill.. DRAM? What? If something is going to fade away it is the HDDs..

  • They give no information about how they measured and came up with this: a dollar's worth of NAND flash improves PC performance more than adding a dollar's worth of DRAM. The closest they come to explaining it is this: After reviewing a "wide range of DRAM and NAND configurations," as well as nearly 300 industry-standard PC benchmarks

    Total garbage. After working with systems that have huge amounts of RAM in them, I can only conclude they are basing this off of Microsoft's paging algorithms. Put the swap/page

  • I'm coming in a bit late to this debate, but I got a completely different take on what the article was about than just about every post here.

    Everyone here seems to have used the article as an excuse to drag out the old "tired" debate of NAND vs HDD (and DRAM in this case) and which is better (from a technical perspective). I didn't see anything in the article that compared these on a technical front. The article was about the NAND market vs the DRAM market going into the future. It makes total sense to me.

    • Re: (Score:2)

      by Arlet ( 29997 )

      For instance, my main development machine is (a fairly typical) quad-core machine with 8GB RAM and lots of HDD. With the various development tools I use, I generally run about 75% RAM utilization with little or no swapping. If I were to add another 8GB RAM I would see virtually no performance increase

      Why ? The extra RAM could be used as additional disk buffers. The fact that your current utilization is only 75% doesn't mean that extra RAM won't be used. It could be that the OS has a strategy to keep some f

    • Re: (Score:2)

      by epine ( 68316 )

      I read the same article. The problem is that the entire article should be rendered as fine print underneath a HOLLYWOOD sized YMMV billboard.

      Also the TCO on SSD taints the economics: failure modes are changing at a speed that gives even a hard core geek a rational ignorance skin rash. There was a nice post above on the physics of desperation. I can add DRAM without a major update to my mental catalog of high-performance electronics failure modes.

      Also I don't get the economic argument in the first place.

  • The greatest performance limiter of today's top-of-the-line computers is the mechanical hard disk. Although the article may have some concepts screwed up (I assume), the one upgrade that makes the greatest _apparent_ improvement in performance is switching from an HDD to an SSD. Yes, it's true that more DRAM helps, but any decent NEW system today already comes with 4GB of RAM (2GB if you really cheap out). 4GB is overkill for most users, so switching to an SSD will have a greater impact on general perfor

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