I meant power usage
My bad. Legit Reviews shows
14W more power consumption on an HD7970 Vapor-X in 4 games. Not sure how much more 7970 GE uses specifically in BF3 with this new driver. Per Legit Review, the average power consumption of the GTX680 TOP system is 364W in games vs. 391W for HD7970 GE Vapor-X. GTX680 TOP costs
$518 with shipping and has no free games. Newegg has Gigabyte 1.1ghz 7970 which costs $450 with 3 free games and is going to be 7-10% faster on average than the GTX680 TOP (if not 15% at 1600P). The power consumption difference between 680 and 7970 GE is practically immaterial in the context of the free game bundle, the price difference between 2 cards, the performance and overclocking advantage 7970 GE holds. Even without the free games bundle, HD7970 / 7970 GE cards cost less than GTX680s and perform as fast or faster. The game bundle puts GTX680 completely out of the running and if you consider overclocking, unless you get GTX680 Lightning, GTX680 isn't even on the map without a hard volt mod. Even if you care that much about power consumption, feel free to reduce the clocks of your HD7970 to 1Ghz and drop the voltage to 1.05V and have power consumption at GTX680 level with similar performance and still 3 free games.
Keep in mind, AMD ships HD7970 GE cards with conservative BIOS that cranks the GPU to 1.212-1.256V at load for just 1.05ghz. That's simply not necessary and quick adjustments in MSI AB can take care of that bringing a stock HD7970 GE 1.05ghz very close to 680's power consumption. Alternatively you can probably overclock that HD7970 Vapor-X they tested to 1150-1180mhz without even touching the voltage. I would expect gamers who are into overclocking and power consumption to find some balance by manually tweaking their overclocks and undervolting to achieve such a balance and not stick to AMD's 1.25V BIOS settings. The power consumption continues to be blown way out of proportion on an enthusiast forum where quick tweaks can resolve a lot of these issues and for starters an enthusiast gaming system with a GTX680 is already drawing well above 350W.
I know I keep repeating it but it's simply not necessary to crank 1.25V into an HD7970 for 1.05ghz settings:
Max GPU voltage is about 1.182V. I think it's fair to say that even if a person has no intention of overclocks, HD7970 / GE can operate at well below 1.25V at 1.05Ghz if the user cares to squeeze every ounce of power consumption efficiency.
And again with HD7970 1.1ghz Gigabyte card going for $450 with 3 free games, GTX680 is clearly overpriced now even if you do take into account 30W extra power usage at load if you don't want to use MSI AB and just look at out of the box price/performance and cost per FPS including electricity costs.