Crescent, did you try other stability testing than SuperPI for your 165? SuperPI is extremely sensitive to memory configuration. (Not just the speed, but also the gamut of timinges et al.)
I'd suggest testing with following method.
1. Go to the BIOS and load "Optimized default" or something in that vein
2. Reboot and go right back into BIOS.
3. Shut down the PC and wait 10 mins.
4. Start the PC and go right to BIOS.
5. Make changes to your liking, except the ones related to OC'ing
6. Reboot and go right to BIOS. This time make changes for your desirable OC, but leave the memory configuration untouched except setting the divider @DDR200 (1:2, 100MHz)
7. Set the LDT multi at x3. Play with different CPU multies because for some reason some mobos don't behave with certain multies. For example, a system could be stable @6x300, but not @9x200. It's just an example but you get the idea.
8. Now if #7 doesn't work, try different memory dividers. Like CPU multies, some dividers work better than others. And no one can tell you which one's the best for your board but yourself. Try different ones, of course under your memory's limit.
9. BIOS flash?
I can't imagine an Opteron with 2.2GHz ceiling..