I'll only be running my GTX480 with the AXP; besides my case has a 200mm front intake fan, and since I had to remove the HDD cage to fit the GTX480 with the AXP, I guess airflow to the Southbridge won't be a problem.
Just another question - are these boards quick to boot ? I've read somewhere some models took a long time to boot. Was that an isolated problem / bios updtate needed / incorrect setup, or is it general ?
The Rampage Iv Extreme does take a long time to get to the bios screen, but after that it's fast.. I say a good 10 seconds until you see the bios writing on your screen.
It won't be a night an day experience from a 4.2Ghz 920 to a 3820. I'd wait for IVY a bit more.