4 ms·
Most CPU RAM is much slower than GPU RAM. GPUs typically pack RAM 2 generations ahead with a wider bus than anything you'd find on a consumer motherboard.
by BobbyJo 3y ago
Most CPU RAM is much slower than GPU RAM. GPUs typically pack RAM 2 generations ahead with a wider bus than anything you'd find on a consumer motherboard.
- winwang 3y agoFor reference, DDR4-3200 in quad channel is ~100 GB/s while a 3090's VRAM is 960 GB/s. Of course, most consumers only have dual channel. M1 Pro is 200 and M1 Max is 400. Which is slow for GPU memory, but incredible for main memory -- although I'm not sure how much of that a single core can actually pull.
- KolenCh 3y agoThe Anand tech article has profiled this. IIRC the CPU cores has access to half that band width only, which is still quite a lot.
- andrewstuart 3y agoThe AMD Ryzen™ 9 7940HS uses DDR5-5600, which I understand to be about 89.6GB/s in a dual channel setup.