Originally Posted by NorthEndJon
I would think you probably could get away with a 570, but you'd be VERY close to the top of that PSU. OCing would be out of the question. I'd say stop at the 560Ti. Then you're not running that PSU full bore, and you might be able to enjoy that 80+ bronze efficency.
You would pretty much be dependent on the quality of the PSU - i have seen an OC'ed i5 750 at 4.2 and GTX 480 OC'ed on a 450W PSU, but it was a nice unit made by FSP.
If its a joker 500W unit you will be out of luck - but if it is a decent brand you would be able to throw pretty much anything you want in there.
The noise is what kills these boxes in the end. They are LOUD.