At stock, i wouldn't think they would differ much in temperature. Though my experience is only with the 3570k. You can overclock quite a bit, and with that cooler should be a breeze. Although no overclock is a guarantee, put some time and effort into it and you can achieve 4.5-4.8 with Ivy though its a tough road getting there and every cpu is different. Most people on Toms i've read if you didn't pick up a SB and your choice is SB or IB then you should go Ivy bridge. Good luck on the build.