My GTX 670 doesn't heat my room up at all. Got it running at 1240 / 7500 Mhz, plus a 4.4 Ghz Intel 980 and my room temperature isn't affected at all. Don't underestimate how useful lower power consumption and temperatures are for gaming in a normal room without air conditioning. I hate having to play games inside an oven due to the amount of heat most graphics cards normally put out.
From a watt / temperature to performance level, Nvidia are the clear winners this round, I'll enjoy gaming in comfort while current AMD users endure their gaming room being heated up to 25+ degrees.
Its also funny seeing anyone with an AMD CPU arguing about AMD GPUs having better performance. You know that by pairing an AMD CPU and GPU, you are going to have significantly worse performance in 99% of modern games than an Intel CPU + Nvidia or AMD GPU right?