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Doesn't SRAM have much lower power density than logic with the same area though? Hence why AMD can get away with physically stacking cache on top of more cache
by jsheard 2y ago
Doesn't SRAM have much lower power density than logic with the same area though? Hence why AMD can get away with physically stacking cache on top of more cache in their X3D parts, without the bottom layer melting.
- Kon-Peki 2y agoYes, cache has a much lower power density and could have been a candidate for that space. But I wasn’t on the design team and have no basis for second-guessing them. I’m just saying that cramming more performance CPU cores onto this die isn’t a realistic option.
- wtallis 2y agoThe SRAM that AMD is stacking also has the benefit of being last-level cache, so it doesn't need to run at anywhere near the frequency and voltage that eg. L1 cache operates at.