Advanced Micro Devices Inc (AMD)

[Ixse]

CJ, 83mm2 for 512K and 114mm2 for 1MB don't add up.

130nm 1MB Opteron: 193mm2
130nm 512K A64: 150mm2

So on 130nm 512KB cache takes 43mm2 die area.

90nm 1MB Opteron: 114mm2
90nm 512K A64: 83mm2

So EITHER:
- on 90nm 512KB cache takes 31mm2 die area (in case A64 512KB is a half cache Opteron) OR
- on 90nm A64 is a distinctly different die with different circuits with different functionality (different from 90nm Opteron that is).

My point is I can't explain why although the cpu goes shrinks from 150 to 83 (i.e. 45%), 512KB cache only shrinks from 43mm2 to 31mm2 (i.e. 28%).

BTW, Keith (and me too) just repeat what Rivet said in an investors conference call which was that the 90nm A64 (with unspecified amount of cache) came in at either 98 or 102mm2, and that he couldn't tell which from the top of his head because it wasn't his area of expertise. JFYI.

Kind regards,

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