I missed something here. I was referring to the PSU.
Opps sorry. I thought you were quoting Danny's recommendation of no more than a 5570 with his current PSU. Was just trying to clear up any misconceptions for the OP.
After further reading looks like everybody has a different opinion on what the op's current PSU can handle.
I'll just bow out of this thread being I have no first hand knowledge of the quality of that particular PSU and what it can handle.