Just to make sure that none of my other Wintec AMPX memory was bad, I threw the 3 good sticks in last night and ran memtest on it for nearly 6 hours with no errors. That was at 2.2v (for the ram). I read around a bit online and there seems to be some inconsistency with the voltage this memory should run at. Some places say it should run at 1066 at 1.9v, while others list it as 2.2v for that speed (including the PDF spec sheet at Wintec). So a little while ago I dropped the voltage back down to 1.9v and memtested it for about 15 minutes with no errors. I'm still not 100% sure if that's correct but it seems stable enough. The heat spreaders always seemed quite hot at 2.2v. I'm honestly surprised that I only have one bad stick after running it like that for so long.
So I messed with the fsb a little and booted it at 800Mhz 1:1 for a 3.4Ghz CPU clock... and it worked the first time. With that bad stick of memory in there it was a nightmare trying to get my previous system to boot after changing FSB settings.
So... of course, I had to crank it up to 450Mhz FSB.
So now I'm running at 3.83Ghz at 1.3v with the ram at 900Mhz (for now) and its running OCCT without a hiccup. The temps are a bit warm (59,55,55,54 on the cores) but not bad at all. The memory timings have been at 5-5-5-15 the whole time.
It sucks that I probably have to send one of my good sticks in to RMA the bad kit. I think I could probably hit 4Ghz easy with this setup today.