My older systems
I have two 'legacy' Macs, both with powerPC (PPC) processors.
The 2001 model has 256M of RAM, the 2004 model has 512M of RAM. Both were abandoned by Apple long ago, and no longer
enjoy the ability to run the current MacOS. This is a problem when depending on a single vendor for everything.
My 2009-vinage computer has 6G of RAM, an Intel CPU, but it's not a Mac. It runs Linux, and can run other OSes as well, but I only do that with virtualization.