920's and 940's clock very well. I think you need to take a look at the 920 clocked to 4.3Ghz on the EVGA board down one forum. That is on air, and it's also 24/7 stable.
i think jakup showed a short 4.2GHz prime
i seriously DOUBT that retail chips will be able to get stability past 4GHz that easily unless evga board is doing something special plus they get extremely hot when fully loaded
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