I'm lost with this, hope you can help me.... Running GPU-Z the program tell me that my VGA is running currently at X4. My mobo is a Asus P5Q-E, according to Asus this board supports PCI-E 2.0 at full X16 speed, just the speed will be lowered if I do crossfire....so I don't know why the PCI-E slot isn't running at x16 (how to know if the slot are running with the 2.0 version)???? for the record I must say that the VGA is connected into the BLUE (main) PCI-E slot. Thanx. Edit:Attached a GPU-Z screenshot.