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HBM2 is like 2Tb/s, how is HBM3 7GB/s ?
by volta83 6y ago
HBM2 is like 2Tb/s, how is HBM3 7GB/s ?
- virtuallynathan 6y agoI think that’s per-Pin bandwidth?
- hajile 6y agoHBM3 wasn't just supposed to be about speed. It also offers a 512-bit option that doesn't require a silicon interposer. I'd guess this was added to make cheaper consumer GPU designs possible. I suspect they're using the HBM2 spec for the narrow bus and cheaper interposer while keeping speeds lower and only using a couple stacks instead of the 16 or so HBM2 stacks required for those 2Tb/s speeds you mention. It makes sense given that their chip likely couldn't use a huge amount of bandwidth anyway.
- vmception 6y agoHBM3 was expected to be like 4GB/s per pin which was seen as double HBM2 per pin, so this is therefore almost even double that, which is good news The HBM2 total memory bandwidth is like 2TB/s, just different scale Anyway I could totally be using wrong nomenclature and terminology, feel free to discuss, these aren't assertions or aren’t strongly held assertions