🚨Custom HBM frees up die space for compute🚨
On Rubin, HBM controllers and PHYs take up roughly 16% of the GPU die. On Feynman with NVHBM, we estimate that falls to ~4%.How: the memory controller moves off the XPU and onto the HBM base die, and the wide standard PHY is replaced by Nvidia's compact NV-HBI die-to-die link. Samsung's custom HBM4 interface is ~60% smaller than its standard PHY.Nvidia claims up to 25% more die area for compute, up to 30% more bandwidth, and 15% lower HBM power vs standard HBM4E. (1/2)🧵The copyright of this article belongs to the original author/organization.
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