I have an octo-core 4,1 with the 4870 inside and an apartment with terrible air flow, so it's always at least 10F hotter than outside, even with the window wide open (there's a single window overlooking an alley). Since it seems to be well known that the 4870 was a power hog, I was just curious if anyone had actual numbers on the power consumption differences between a 4870 and 5770 both at idle and under load. I don't really game, but I'm considering spending the $224 with Edu discount to save power and reduce BTU output. Or maybe this is just a silly idea. Thanks.