Why don't we all read this:
http://benchmarkreviews.com/index.ph...1&limitstart=8
Surface Finish Impact
Sorry haven't bothered, and I'd go with the previous posters comments.

Yesterday I turned up the voltages to 1.3v for both cards, and temps were still sat at 30-31c. That's with a q6600 @ 1.54v sat in the loop.

RLM