Well, I personally think the power/electricity concern is a valid issue. GTX 470/480's power consumption under both idle and load are clearly disappointing and a step backward from what the GT200 series brought, particularly with power savings while idle.
I guess part of it is the shock of seeing how much more power GTX 480 consumes under both idle and load, but I think the real shock is that the 2nd card is fully scaling where in the past, Nvidia has typically shown considerable power savings in multi-GPU configs. So this time around, that 250W TDP is a very real indicator of its power draw, where in the past, it might've been overstated. GTX 280 rated TDP @ 236W for example is actually closer to 200W in practice. So that extra 50W TDP is a real 50W, and in SLI, its a real 100W.
How this translates to your power bill should be relatively easy to calculate, I'm sure there's power calculators on various sites but for me, its like running an extra 100W lightbulb while you game and a 40W lightbulb when you're not, all year round. In the summer time, you need to factor in the additional cost of air conditioning, if you have central air this may cost more, if you have a room unit or multiple condenser units you may be able to localize cooling a bit to save on overall costs.
I personally know for a fact, an extra 100W lightbulb in my gaming room is going to lead to considerably more discomfort unless I crank up central air, which will increase my overall cooling costs. Otherwise, I'd have to look into a window cooling unit, which is going to reduce temperature discomfort, but simultaneous increase noise pollution and discomfort. Your actual situation may vary of course, depending on what you're running now.
That's why I'm looking at 2x470 in SLI over 2x480 SLI, I'm willing to deal with another 15-20W, 70-100W......no. Honestly just test it out yourself if you're unsure, put a 100W lamp next to your PC and run it whenever you game. Even my 40-60W energy efficient bulbs get turned off when I game...its noticeable.
Edit: and on the flipside with cooling as others pointed out, there's heating savings in the winter, but winter is over, and I can always put on a snuggie in the winter when I'm cold.....
post edited by chizow - 2010/03/27 14:45:04