R9 280/X requires 30 Amps on the 12v rail & a 550W PSU minimum
GTX 280 requires 40 Amps on the 12v rail & a 550W PSU minimum
Sorry, never heard of that PSU brand before. The label says 2x 12V rails of 12A & 15A. But no idea what the combined rating is, as you can't just add the numbers together. Still, i'd doubt it at those low numbers anyway,
Wasn't sure if it was a typo, as GTX 280 is old. So covered both bases.