3 ms·
PCIe bifurcation - so splitting one of the x16 slots into two x8 or similar.
by manav 2y ago
PCIe bifurcation - so splitting one of the x16 slots into two x8 or similar.
- metadat 2y agoWorth mentioning - this also cuts the available bandwidth to each card by 50%.
- angoragoats 2y agoWhile you're technically correct, assuming you're using PCIe 4.0 or higher, the performance difference between x8 and x16 is practically zero.
- metadat 2y agoIs this because the graphics cards are not using all available PCIe bandwidth? Or why?
- angoragoats 2y agoYes. In fact, even running a video card in a 4x slot (again, assuming PCIe 4.0) results in only a modest (5-20%, depending on what you’re doing) drop in speeds.
- Tepix 2y agoEven for training?
- angoragoats 2y agoI haven’t done a ton of training but everything I’ve heard and read indicates that PCIe 4.0 8x provides enough bandwidth for just about any application. You might see a negligible drop in performance, but no more than a few percent.