Hi guys, I am ready to rip out my hair... any help you could offer would be greatly appreciated!! I just built a system (I have built many) my problem is when i have the pci-e 3.0 card plugged into the pci-e 3.0 port, anytime i run any kind of heavy graphics it crashes and resets the drivers, and the HDMI sound cuts in and out. if i put it in any of the other slots(pcie2) it works fine. i have put this graphics card in another computer (pcie 2) and it works fine... when i put a pcie2 card in the pcie 3 slot, it works fine... i don't have access to another pcie3 board or gpu I know that the gpu "downgrades" to pcie2 and I'm assuming that the slot would do the same, so i am guessing that one of the items is messing up when it goes into pcie3 "mode" I have tried reinstalling drivers, windows and updating the bios in both card and board nothing helps... I don't really want to rma both devices so if anyone knows of a way i can figure out which one is defective i would be a happy camper (as much as i can after 3 RMA's on the same build ) relevant specs of the build: Sabertooth 990fx gen3 rev 2.0 AMD FX 8350 Asus HD7770 1G GDDR5 Corsair Vengeance ddr3 (1866) 750W PSU Attila.