Update small CPU details

[pt13762104]

The PS5's CPU doesn't have less instructions, it has less throughput compared to a Zen 2 core. The effect on games should be minimal.

[elektricM]

Sorry for the slow reply. Going through this hunk by hunk, because the title undersells it: three of these are factual corrections and one is a performance claim.

Taking as-is:

• Dropping Limited instruction set (some AVX features missing) and replacing it with the FPU line is the right call, and the Chips and Cheese link is the correct source. The ISA is not cut down, AVX2 is there, the 256-bit datapath is halved. The old wording sent people looking for missing instructions that exist.
• performs admirably to performs reasonably. Better, the original read like marketing.

Needs one command before it goes in:

• 8 MB L3 cache (4 MB per 3-core cluster). Consistent with Oberon keeping both 4 MB slices while masking one core per CCX, so I expect you are right, but the page should not carry a number nobody has read off a board. Paste the Cache block from lscpu on yours and I will take it.

Needs a source:

• comparable to a RX 5600 XT or GTX 1660 Ti (6600 XT / RTX 2070 when unlocked). This changes the stock comparison downward and adds an unlocked one, and the repo has no numbers backing either. Where does it come from? If it is your own benchmarking, say which games and settings and I will take it with the attribution. If it is a community figure, point me at the thread. The compatibility page is supposed to be the place that arbitrates this, so I would rather not have the intro contradict it silently.

There is also a trailing space added on the CPU Performance line in specifications.md.

If you would rather not chase the GPU number, tell me and I will merge the FPU and cache parts and leave the comparison alone.

[pt13762104]

I think I haven't seen much GPU benchmarks, so maybe that could be ignored. There's one video comparing it to the 7600: https://www.youtube.com/watch?v=CYDv1SfD2Pc, but one game probably isn't enough.

lscpu on the BC250: https://openbenchmarking.org/s/AMD%20BC-250%20(6%20Cores%20/%2012%20Threads).