The 12.36 bios may support the new E0 processors but it's likely a far from perfect bios and a few incompatibilities like you're getting should be expected. I'm just happy to hear that you can run an E0 on a board that is this old. Did you try adjusting all of your voltages a little bit, including your memory voltage. You could also try dropping your memory down to DDR2-800 speeds to see if that helps. With a 10X multi, you have a lot of flexibility. Asus has been good to owners of this board with more bios updates than most manufacturers give you so hang tough and maybe they'll get this fixed in the next release. 12.36 is beta so there's still hope for an official final bios release.

I'm using 12.36 and I just re-installed my E8400. These boards aren't great with Quads but they run better than a lot of newer boards when you're using a Dual Core. I'm back to 450 MHz x 9.0 for my Prime stable, 24/7 settings and with this new bios, they finally fixed the problem with Stand By mode. When I first installed that E8400 6 months ago, it would go into Stand By mode but when I tried to resume it would always hang and I'd have to re-boot. Now it works flawlessly.