Hey, can u help me plz,

specs:
ASROCK Z87 Extreme4
ATI Gigabyte R9 280x
PSU Ocz 650W
Win 8 or Win 7

Bios is updated to latest version from Asrock website.

PC works normaly with onboard GPU, when i switch to graphic card come problem. Windows constantly reboot yourself.. if come to win desktop than display lines not clear picture.
Sure, tested in all PCIE slots, same problem.
I don't know how to describe everything.
Tested with other graphic card - works like a charm, ATI R9 280x tested in other PC - works like a charm.

Where is the problem? Im sure OCZ 650W PSU is enough for this GPU