I left a review on NewEgg saying I would never recommend this card to anybody, and I'm here to take that a step further as well as ask what manufacturer has the best 7970 for BItCoins mining. My electricity is cheap, so power consumption is not an issue.

Anyway, this particular Gigabyte card is terrible:
 - Two of them in one case runs so hot that I need to let in cold, Alaskan air from outside to keep them cool. Crash at above 90C within 3 minutes at stock clocks.
 - Run stable at 1180/110 and 1180/1100, but not stable at 1190/110 or 1190/1100. All of these combinations have the same power draw and temperature, by the way.
 - I haven't tried water cooling, but based on how fast the temperature increases, I'm not convinced that'll keep them very cool.

Now the other question:
Which card has the highest hash rates? I sold off the Bitcoins I bought when the prices were low, and have just over $425 to put towards a 3rd card for my rig.
I've got an extra 550 watts on my PSU, so I don't think I have any real limitations other than temperature or money.