Tom's estimates of overall usage for different usage profiles, not gaming loads.
Huh? 2 of those profiles are Gamer and Enthusiast (which is using the card even MORE than a typical gamer).
Even with those profiles adding in idle time the GTX 480 is still pulling 97W average more than a 6950 for their gamer profile. That would be $97 a year in electricity.
Your math doesn't add up.
HD6950 consumes about 18W at idle and 163W in gaming.
GTX480 consumes about 54W at idle and 257W in gaming.
http://www.techpowerup.com/reviews/AMD/HD_6950_1_GB/20.html
Assuming a ridiculous case of a person who has no job, no gf, no wife, no kids, no hobbies, doesn't play sports, doesn't do anything but game 8 hours a day for 365 days:
Gaming: 8h x 365 days x $0.15 c/kW x (257W - 163W) = $41.17
Idle: 16h x 365 days x $0.15 c/kW x (54W - 18W) = $31.54
Of course, imho gaming for 8 hours a day for 365 is a very the exteme case scenario (outside of distributed computing projects). If you are gaming 8 hours a day, the last thing you should worry about is electricity costs.
The reality is GTX480 is at least 15% faster than an HD6950 at stock speeds. So the 2 are not even comparable in the first place. A competitor to the HD6950 is the GTX560 Ti.
If you want to compare GTX480, its 2 closest competitors are HD6970/GTX570 which consume a lot more electricity than the HD6950. That's not to say anything about manually undervolting the GTX480 card in idle.
None of that says that the GTX 480 does not pull 160W more than the 6950 under load, dumping all that heat right into your room.
Where you getting 160W more power? Which review shows that?
There is 0 chance a GTX480 pulls 160W more at load than an HD6950 does in anything but a power virus, which has no relevance to gaming. In Tom's gaming tests, the average power consumption difference for games is around 100W. That's without turning on 20% power tune on HD6950. But a ton of people have +20% on for their AMD card to get 100% of the frames. I know I do with my 6950. So it's really 80W or so between a 6950 and GTX480, and even less between an HD6970 and GTX480 - 2 comparable cards.
Either way, if this card is not for you, that's fine. Let's not make this thread into why it's not for you. If you are concerned about an extra 80-100W of power at load, Intel has Core i3s instead of Core i7s; AMD has HD6850 instead of an HD6970, etc. GTX580 overclocked consumes even more power than a GTX480/HD6970, but that doesn't stop it from being an extremely fast card.
Using your argument, an HD6870 is better than HD6970 because it's only 15% slower and consumes yet again
80-90W less at load.
How does this in any way make your case? The 980X has the same TDP as Anand's bench 920. It's not some monster compared to the 920. And it's pulling damned near 500W there.
Sure it is. 980/990X @ 4.2ghz+ consume a lot of power:
http://www.xbitlabs.com/articles/cpu/display/core-i7-2600k-990x_12.html#sect0