> One neat thing about PCIe is that every PCIe compliant device must support using less lanes than it can. So your GPU which would like to work with x16 must su

> One neat thing about PCIe is that every PCIe compliant device must support using less lanes than it can. So your GPU which would like to work with x16 must support x1 etc. I tried this with a SAS controller. They make 16-port SAS PCI-e x8 cards, so on a x1 slot I should get full speed for 1-2 SAS devices, and the SAS drive(s) will only slow-down if I add more... right? Wrong. Even with a single device, you get about 1/8th the speed you should. So, yeah, PCI-e cards properly downgrade to fewer lanes, but not necessarily in a very useful way.