Yeah I was wondering this myself. Maybe there is big Navi, and then bigger NaviThis is an even stronger case for more than 80CU in a ~500mm^2 GPU with HBM controllers. 1 CU = 3.2mm^2.
Either we get more than 80 CU (96 or even more) OR Big Navi is much less than 500mm^2.
Because remember, the mi100 has 128CUs with 120 active
Also, 1 CU is smaller than 3.2. I calculated through pixel measurement that 1 DCU was ~ 3.6mm2, by 28 = 100mm2 for CU only. Which seems accurate as there is a lot of GPU space dedicated to other things besides the CUs, cache probably.
The XBSX die shot is online so please verify my estimations if you feel like it