will my psu run a r9 280x dual x sapphire?

[BreZe]

my system so far, everything runs perfekt:

psu: 520 Watt Seasonic S12II Bronze
cpu: Intel Core i5 4570 4x 3.20GHz
gpu: Sapphire HD 3870 (will be replaced with the r9 280x)
mainboard: Intel DH87RL
ram: 8GB Corsair Vengeance LP DDR3-1600 DIMM CL9 Dual Kit
other things that consume power: samsung ssd 840 evo 120gb and a dvd drive. win7 64bit

 

[Inertia01]

i would recommend a 700-750w PSU with 2 6-8 pin molex gpu connectors on a 24a rail for that card