Can the rasurbo Real&Power 650W support a R9 280X?

Can the rasurbo Real&Power 650W support a R9 280X or should I look at a lower range graphics card?
This is a GPU upgrade and I would rather not have to buy a new PSU.

Current spec:
i5 2500k @ stock
GTX 460 SC (EVGA)
2 HDD
4 Fans
Rasurbo Real&Power 650W

I can only find a review on the 550w version and that failed the 100% load test so should technically be labeled down to 450-500w.

You should be fine so long as your not OC'ing the nuts of everything + 10 fans etc.