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CPU DRAM can't really be used for inference efficiently -- inference mostly wants memory bandwidth, not memory capacity, and GPU DRAM has >10x more bandwidth. T
by why_only_15 13d ago
CPU DRAM can't really be used for inference efficiently -- inference mostly wants memory bandwidth, not memory capacity, and GPU DRAM has >10x more bandwidth. The fabs can switch between them but you can't switch after the fact.
- sroussey 13d agoThose machines with GPUs still need RAM of their own, and they generally want large caches to avoid SSD penalties. You even see this spill out in the form of costs for KV cache in <1min, 5m, 1hr rates etc.
- why_only_15 11d agoyeah there's some KV cache offload
- halJordan 13d agoThe majority of inference actually does happen in cpu.
- why_only_15 11d agoThis is just wrong unless you're using some confusing definition. Notice that companies trying to do lots of inference aren't looking for CPUs, they're looking for GPUs/TPUs.