That'd definitely be a waste of CUs, so maybe that makes Cerny's hypothetical example kind of odd. If they ever seriously considered a 48 CU design, I wonder for what reason if it'd mean 12 disabled CUs.
I somehow missed this xD; thanks for the link, that covers any needless hunting.
Actually speaking of PS5 GPU shape, something kind of came to my attention. Seen a few photos breaking down the allocation of things on the PS5 APU from the x-rays:
and then I came across this GPU ref image for Navi 21:
Now I can't see an Infinity Fabric Cache Controller in the PS5 shot similar to Navi 21, but is it possible they have extremely cut-down slices of cache sandwiched between PHYs and a cache controller as the small (maybe unmarked) grey block between the two pairs of memory controllers interfacing to the L2$?
I'm just asking because it's genuinely slightly perplexing and I feel like I might've made an analysis on this elsewhere off of a bad read, because even now I'm looking at it still and can't see how any theoretical amount of IC slice sandwiched between the PHYs would be even 2 MB in size going by the size of the actual 2 MB (or more specifically, 256 KB) L2$ blocks on the GPU. Thin them and lengthen them a bit to fit in that space and you get maybe six in each slice, or 6 MB in all. Would not sound worth it in all honesty.
Though, just looking again at the Navi 21 picture I should probably figure the actual cell size for the IC is a lot smaller than that for the L2$ (cell density per cache level is something I've only kind of just started looking into in terms of node process fabbing), which is why I was thinking if there's actual room there (can't explain for where the Infinity Fabric Cache Controller would be at or why it'd be a small block between the GDDR6 memory controllers since that looks contrary to how the cache controller's actually supposed to function) it could be closer to 12 MB - 24 MB?
Honestly would just enjoy some concise clarification so the book on "does it have IC or doesn't it" can be closed shut once and for all, these die x-rays should be enough evidence anyway IMO.