Good job Gman!
Correct me if I'm wrong here guys, but I do believe on most Intel boards that the "default" memory voltage is 1.8v.
So if you are running it at default that's what it should be.
"My" Corsair memory recommends that I use 2.1v for stability @ 4-4-4-12 timings so that's exactly what I have it set to and it is very stable.
Btw, with my current memory divider set to 667Mhz and my FSB set to 334 (334* 10), my memory speed ends up being 834Mhz @ 2.1v...I don't have to overvolt them until I go over 900Mhz.