and about the same
Seriously, the 930 uses Intel's 65nm process versus the 90nm on the 630, so the 930 will run a bit cooler even though it's got dual cores. The 600 series on the 90nm process is about as big a power hog as there is out there today, particularly if you OC it. I have a 630 and they do run hot! The smaller process also makes for a bit better overclocking potential on the 930 as well. As for games, unless you can use dual core (and most games can't) they'll both be about the same.