I would buy a regular 7970 and overclock it but I've heard that the 7970s are better binned.
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More aboutneed choosing 7970 edition
Well, I was gonna recommend the sapphire, but the gigabyte version offers a better cooling solution and comes with a 3 year warranty vs. sapphire's 2 year warranty.
The gigabyte seems great, but I'm a bit hesitant to buy it as I'm returning a gigabyte 7970 (not ghz) because its defective (driver crashes at stock factory overclock and yes I have tried reinstalling drivers and using driver sweeper)