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Chilled water.
I don't see how you got those clocks so high. Have the same card, and just thrashed the pants out of it. Temps were 60C, and 1.0GHz was the breaking point.
Just good cards, good power delivery and a good psu. And of course the chilled water.
Will not be doing it again Plus the water blocks were just a loan from a mate.
Dont want to kill them want sell them and get a 6990
My power delivery is good, an 850W BeQuiet. The card should be decent, Sapphire reference. Does a 20C lower temp let you go that much higher with clocks? I guess i'll just have to settle with the second best single 6950 score
Open the windows and get a big fan on the job
Is it that bad ? Are you in Scotland. Im northwest and not seen anything yet.
Update - cards are liquid cooled