Would this 550w power an R9 290 and an FX 8350

Solution
It's a quality PSU, but that GPU and CPU need a lot of power to run. It might work, but I wouldn't recommend it as you would be putting quite a strain on the PSU.

In my humble opinion, you should get the 650W version of that PSU.
It's a quality PSU, but that GPU and CPU need a lot of power to run. It might work, but I wouldn't recommend it as you would be putting quite a strain on the PSU.

In my humble opinion, you should get the 650W version of that PSU.
 
Solution