So far, I ran Crysis Benchmarks, on Low all the way up to VeryHigh with MSAA x4, didn't notice anything 'odd' about the image. ATITool keeps getting errors, but even with my card at stock speeds. I'm going to run the demo of 3DMark06, and see what happens there.
This is the card I have, I do have to say it was an upgrade from my 4650 that I had.
About a 12% overclock. I think it's just because of the card though, since it's the "energy efficient" version, and it pulls power from the motherboard, and not an external power source.