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Comments

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Research Shows RISC vs. CISC Doesn't Matter

edxwelch Re:The article is bad - mfg technology dominates (155 comments)

From the origonal paper www.cs.wisc.edu/vertical/papers/2013/hpca13-isa-power-struggles.pdf (which ExtremeTech does not link to):

Technology scaling and projections:
Since the i7 processor is 32nm and the Cortex-A8 is 65nm, we use technology node characteristics from the 2007 ITRS tables to normalize to the 45nm technology node in two results where we factor out tech-
nology; we do not account for device type (LOP, HP, LSTP).
For our 45nm projections, the A8â(TM)s power is scaled by 0.8Ã-- and
the i7â(TM)s power by 1.3Ã--. In some results, we scale frequency
to 1 GHz, accounting for DVFS impact on voltage using the
mappings disclosed for Intel SCC [5]. When frequency scal-
ing, we assume that 20% of the i7â(TM)s power is static and does
not scale with frequency; all other cores are assumed to have
negligible static power. When frequency scaling, A8â(TM)s power is
scaled by 1.2Ã--, Atomâ(TM)s power by 0.8Ã--, and i7â(TM)s power by 0.6Ã--.
We acknowledge that this scaling introduces some error to our
technology-scaled power comparison, but feel it is a reasonable
strategy and doesnâ(TM)t affect our primary findings (see Table 4).

2 days ago
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Research Shows RISC vs. CISC Doesn't Matter

edxwelch Wrong conclusion (155 comments)

If you look at the graph "raw average energy normalised" you see that the ARM A9 core has the lowest energy score -> that clearly shows ARM being the most efficient and hence the conclusion is completely wrong.
Still the test is very interesting. I would like to see it updated with latest CPUs

2 days ago
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AMD Launches Radeon R7 Series Solid State Drives With OCZ

edxwelch Re:This is something I wanted for a long time (64 comments)

CPU performance is worse than Haswell and IGP is better - that's what I said. Motherboards are about the same price

about two weeks ago
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AMD Launches Radeon R7 Series Solid State Drives With OCZ

edxwelch Re:This is something I wanted for a long time (64 comments)

They don't anymore. Kaveri is about same price as i3 Core/pentium Haswell, but with more power draw and less performance. Where AMD win is the IGP, which always has been better

about two weeks ago
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AMD Launches Radeon R7 Series Solid State Drives With OCZ

edxwelch This is something I wanted for a long time (64 comments)

I'm glad to see AMD is using their development budget wisely and not wasting it on other stuff, like it making their x86 cores competitive versus Intel

about two weeks ago
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Processors and the Limits of Physics

edxwelch Re:what diminishing returns? (168 comments)

Not really, because the tech is improving all the time. At 20nm the have high-k metal gates and at 16nm FinFETs.

about two weeks ago
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Processors and the Limits of Physics

edxwelch what diminishing returns? (168 comments)

Each semiconductor node shrink is faster and more power effiecient than the previous. For instance, TSMC 20nm process is 30% higher speed, or 25% less power than 28nm. Likewise, 16nm will provide 60% power saving than 20nm.

about two weeks ago
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Switching Game Engines Halfway Through Development

edxwelch Unreal doesn't work well on iOS (127 comments)

He claims that Unreal engine works well on iOS, but this is not really true. Basic features like dynamic shadows are not supported at all and performance is pretty poor - you really need a A6 based device to run it well.

about two weeks ago
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Intel's 14-nm Broadwell CPU Primed For Slim Tablets

edxwelch Re:Thank GOD (96 comments)

If you're running a game you will typically have the GPU and CPU maxed out, so basically all the clever power gating and duty cycle stuff is switched off. Basically, the battery isn't going to last much longer than prev gen CPUs.

about three weeks ago
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AMD Launches New Higher-End Kaveri APUs A10-7800 and A6-7400K

edxwelch Re:OpenCL, HSA? (117 comments)

There are no HSA applications (just a few tech demos) and it doesn't look like they are going to appear any time soon.
HSA will only work on kaveri CPUs, which are maybe 0.001% of the market. Maybe if Intel adoped HSA then there would be some more motivation for developers to support it.

about a month ago
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Elon Musk's Solar City Is Ramping Up Solar Panel Production

edxwelch Re:Sustainability (262 comments)

I don't think there are any rare earth materials used in polysilicon cells. In fact, the solar city cells are cheaper to manufacture because they are using copper instead of (standard) silver electrodes

about 2 months ago
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$3000 GeForce GTX TITAN Z Tested, Less Performance Than $1500 R9 295X2

edxwelch Re:cherry-picked benchmarks (151 comments)

So, only the benchmarks that you say are important count. That's pretty much the dictionary definition of cherry picking

about 3 months ago
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Intel Confronts a Big Mobile Challenge: Native Compatibility

edxwelch Re:Bigger problem than Intel admits (230 comments)

Yes, unfortunately there is no independant analysis, it's just Intel's word against ARM's.
But in the case of binary translation, nearly everyone (except Intel) agrees that it has a performance impact:
http://blog.apedroid.com/2013/...

about 3 months ago
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Intel Confronts a Big Mobile Challenge: Native Compatibility

edxwelch Bigger problem than Intel admits (230 comments)

ARM ran a survey of the top 500 Android apps in the market and found that only 20% are pure Java, 30% are native x86, 42% require binary translation and 6% do not work at all on Intel's platform. To make matters worse the level of compatibility is falling. They also found that running an app in binary translation mode takes a huge performance hit."
http://www.theregister.co.uk/2...

about 3 months ago
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Apple's 2014 WWDC Keynote Will Be Streamed Live; Hopes For a Microconsole?

edxwelch Rumour confirmed!! (147 comments)

The rumour is confirmed here: http://en.wikipedia.org/wiki/A...
Looks awsome! The new Apple Bandai Pippin console features a 66 MHz processor and a 14.4 kb/s modem...

about 3 months ago
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Agree or Disagree: We are in another tech bubble.

edxwelch Re:Tech bubble? (154 comments)

the explaination is quite easy: this poll was from 2001, but was caught in a time wormhole and catapulted 13 years into the future

about 3 months ago

Submissions

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Intel flops on Android compatibility

edxwelch edxwelch writes  |  about 4 months ago

edxwelch (600979) writes "Intel claim that 75% of all Android apps in the market are pure Java and don't feature any native ARM code. Using their binary translator they hope to bring compatibilty up to 90%.
However, a new report conducted by ARM disputes this. They ran a survey of the Android app market and found that only 20% of the top apps are pure Java, 30% are native x86, 42% require binary translation and 6% do not work at all on Intel's platform. To make matters worse the level of compatibility is falling. They also found that running an app in binary translation mode takes a huge performance hit."
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OpenGL 4.4 already has DirectX 12 and Mantle-like features

edxwelch edxwelch writes  |  about 5 months ago

edxwelch (600979) writes "The announcement of DirectX 12 was a big focus of attention at GDC yesterday. The new API will bring Mantle-like low level access to the hardware, reducing the CPU overhead.
The OpenGL talk "Approaching Zero Driver Overhead in OpenGL", on the other hand, received considerably less media attention. The OpenGL camp maintains that the features to reduce CPU overhead are already present in the current version. They suggest using the extensions such as, multidraw indirect combined with bindless graphics and sparse textures, OpenGL can get the similiar "close to the metal" performance as Mantle and DirectX 12."
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Intel engaged in below cost selling

edxwelch edxwelch writes  |  about 7 months ago

edxwelch (600979) writes "An analyst at Bernstein Research has found that Intel is selling their tablet Bay Trail chips to OEMs below cost, concluding that after end rebates, Intel’s tablet revenues are likely to be “close to zero,” while profits will be negative.
Intel has responded that the “special costs” Intel is incurring are not pushing down gross margin.
Intel needs to offer the subsidies to OEMs building $199-$299 devices to bring the bill of materials down and make them competive with cheaper chips from the likes of MediaTek and Rockchip."

Link to Original Source
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Kavari details emerge

edxwelch edxwelch writes  |  about 10 months ago

edxwelch (600979) writes "Details of Kavari, AMD's new APU were revealed at APU13 today. The desktop version will go on sale on 14th January 2014. It will have two Steamroller CPU cores and a GPU with 512 SPs (equivalent to Radeon HD 7750). A demo was showing Kavari running Battlefield 4 at twice speed of a Core i7 4770K with GT630."
Link to Original Source
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AnTuTu benchmarks optimized to favour Intel

edxwelch edxwelch writes  |  about a year ago

edxwelch (600979) writes "A recent report by ABI research showed Intel's Clover Trail+ outperforming SoCs from Samsung, Qualcomm and Nvidia.
However, a EETimes article casts serious doubt about the validity of the report, in particular the AnTuTu benchmark used to test the chips.
"Going from the 2.9.3 version of the AnTuTu benchmark to the 3.3 version, the overall AnTuTu scores increased 122 percent, and the RAM score increased 292 percent for the Intel processor, while the scores for the Samsung processor increased only 59 percent and 53 "
To top things off, somebody analyzed the assembler code in the AnTuTu benchmark and found clear evidence that the benchmark had been tweaked to favour x86 processors."
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The real reason Firefox lost to Chrome: Firefox 4

edxwelch edxwelch writes  |  more than 2 years ago

edxwelch (600979) writes "In November last year Chrome overtook Firefox in market share for the first time. What people don’t realise is that the release of Firefox 4 caused a large part of the decline.
Firefox 4 was a major new release and came with a brand new Javascript engine and HTML5 parser. Unfortunately, these new features came with major memory leaks and performance bugs. The result was that if you used Firefox 4 for an extended period of time the browser would eventually become unresponsive, making it virtually unusable."

Link to Original Source
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Making iPhone games "battery friendly"

edxwelch edxwelch writes  |  more than 4 years ago

edxwelch (600979) writes "An article I wrote for GameDev (http://www.gamedev.net/reference/programming/features/iPhoneBatSave) shows how we made our iPhone game "Armageddon Wars" battery friendly by dynamically throttling the frame rate during game play"
Link to Original Source

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