PCI Express Bandwidth Examination
 

They taped over a 16x card to test 8x/4x/2x/1x speeds:grin:

http://graphics.tomshardware.com/gra...122/index.html

The applications we used (e.g. Doom 3 or Unreal Tournament 2003) require a minimum bandwidth of about x4 PCI Express. Above that setting, it was almost impossible to feel the performance difference