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Hmm... what happened to memory bus width on 4080s? It seems like they went from 384/320 bit width (on 3080) down to 256/190? Anyone know the story behind it?
by izacus 4y ago
Hmm... what happened to memory bus width on 4080s?
It seems like they went from 384/320 bit width (on 3080) down to 256/190? Anyone know the story behind it?
- packetlost 4y agoHiding performance compromises for the sake of cost savings in the most difficult to determine/understand way for laymen.
- jlouis 4y agoMuch larger L2 cache on the GPU. The 30xx cards needs a wide bus to feed it, but with the L2 cache on the GPU, you can get away with a smaller bus width (and faster memory on top, things shifted in the last couple of years and DDR6(X) memory is even faster now than it was). Some of this also has to do with what kind of memory configurations you want to offer, as they are tied to the bus width. So if you widen the bus, you are looking at using more memory chips and having more memory. This pushes the price point upward, and you want it to tier somewhere in the middle of it all. One "mistake" on the 30xx (Ampere) series were that the 3080 was much too powerful for its price point, and you couldn't really cram too much more power out above it due to its memory config. With this change, you can introduce a 4080Ti in between the 4080 16Gb and the 4090 as a mid-seasonal upgrade, and widen the bus a bit to satisfy it.
- Tuna-Fish 4y agoThey greatly increased cache sizes, and cut down the bus width. Same what AMD did on RDNA2.