JapanFreak you'll be fine. At 100% a Radeon 6570 only draws 60 watts. Add in the draw from your CPU, 65 watts? perhaps 105 at the most. Fan draw, DVD burner, motherboard, ect... that's all negligible. I doubt your max draw is over 165 watts.
Your only concern would be if you dropped in, say a 7770 or 7850. Mid range GPU's require an additional power from a 6 pin connector. Something your PSU would not have.
LOL unless your no name brand power supply can only put out 150W now.