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MY brother has 2 in xfire.
They are indeed quality cards they idle at around 30 and at load never over 70.
The noise when at load is not too bad, it is louder than some of the cards he has had(5970) but at the same time its also quieter than some he has had(6990).
He has not oc`ed them at all but there is nothing 2 wont run at maximum so he has had no need too, and also they are oc`ed slightly over stock ones anyway.
The price on oc is cracking my bro paid a lot more when they 1st came out.
All in all a cracking card at a great price![]()

but no problem maxing the games I've played, hasn't gone over 57° (according to msi afterburner) with fans at 47 usually. It is quieter than my case fans so no problem with noise. I have no problems with it so far and don't regret the purchase at all 
Was going to get a 670gtx wf but i think the 7970 would be a better purchase in the long term as it has more headroom for overclocking and faster once o/c ed alittle further from what i've read.