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Got two here, to keep the temps and noise down ive resorted to running a frame limiter in a lot of games, above 65% fan speed they are quite noisy cards. Thinking of ditching them for a single card.I agree with cmndr andi on this.
I have had two gtx470's in sli and while the performance was good they were hot and noisy. Got rid of them in the end, Shudder to think what 3 of them would be like..