I'm having a heck of a time getting 500x7 stable. I suspect it's my ram, but maybe someone can give some insight.

500x6 is stable
500x7 will pass 1mb pi.

Ram is at 1:1 5-5-5-12 (Team group D9GMH...should go WAY higher).
Totally unstable at 4-4-4-12...which I don't understand. It's like the chipset is limiting my ram timings somehow? Is that possible? Chipset voltage is 1.45v, cpu vtt is at 1.3v and tried 1.4v as well. Ram voltage is at 2.3-2.4v. Anyone have any other suggestions? I'm using the very latest rabel's haven bios.

-Collin-