I think you’re getting the wrong picture. Sony didn’t remove any feature from their CPU, instead they reduced the performance. So the CPU will be able to execute AVX256 instructions just like any other Zen 2 out there, but if a standard Zen 2 can retire 4 SSE instructions or 2 AVX256...
Wait what?
If that's the case, it means that the IPC of floating point instructions on PS5's SoC in general is lower than a standard Zen 2, not just AVX256 instructions. (Not necessarily half the IPC, since some code don't exhibit much inherent ILP, but lower)
A reminder that since AMD64, SSE...
I think Eurogamer has also written an article regarding Xbox 360, where it was not recommended to install GTA5's play disc to the hard drive, for the same reason. Fun time!
Marvell Titania 2. No official document on this one. It appears to have 5 CPU cores? Not sure why one looks different than the rest (if those are indeed CPU cores, that is).
One thing to note is that Marvell does provide custom solution per their website:
Now it all makes sense, Sony couldn't...