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I been tempted to bite on this too since a 680 is boring, and seems that hitting 1200 core is the sweet spot as you should be neck and neck with even a 680, and shit, even costs less w/ waterblock.
Only thing I been trying to figure out is which of the ref cards were the best to buy as far as overclocking potential goes.
@ 1200 you'll blow 680GTX away. 7950 is same speed as 7970 on same hz and a 7970 will blow a 680 away @ 1200Mhz. I think more like 1050 you'll start beating GTX 680 in a about half the games. 1200, every game.
I watercool for quiet high clocking is just a bonus. Ever since 6800 days I've watercooled every card I've owned. Just seems all are too loud for me. Basically you CAN NOT hear my computer when on. LOL.
I have an EK acrylic/copper full cover block on a reference XFX 7970. This card needs 1225 mV to stay stable at 1200c/1575m, but despite the high-ish volts, I've been very impressed with temperatures. The highest I've seen is 50C while playing The Witcher 2 for a few hours at 2560x1440 with Ultra settings (ubersampling off). Most other games load the card into the 40s. The rest of my specs are in my sig.