CONTINUED FROM: https://community.amd.com/message/2737903#comment-2737903
Pretty self explanatory, my RX 480 won't have a display if pci 3.0 is enabled in bios, but it's fine if i disabled it.
Is it cause my mobo is old? BIOS not updated?
WINDOWS 7 ULTIMATE
PSU: VENOM RX BOOMSLANG HEMOTOXIN EDITION 700W
16 GB DDR3 RAM
i5 3570k 3.4 Ghz
Possibly either of those, but even at 2.0 x16 you're not saturating the link so there is no performance loss.