Canada Goose Puncher
Join Date: Jun 2013
Location: Extra-west Virginia
It's mostly due to latency. GPUs don't actually need that much bandwidth. There are two ways to look at PCIe links. You can think of it as a parallel interface, where adding more lanes increases the bus width up to a factor of 16 (there's also PCIe x32, but it is incredibly uncommon and nobody talks about it). This is a bit inaccurate but easier to visualize, since parallel links are usually low-frequency and always synced. PCIe is in fact a serial link, or rather up to 16 of them. The individual lanes are not synced, but rather can be staggered and effectively increase the frequency by a factor of 16, if that makes sense.
Originally Posted by TheBadBull
someone sig this