try backing down the .77 to .75 yeah you may stay at 1600 but more stable show us this page
see all of mine are 85c due to under clock if you have a lot of 120 or 125c you are just a bit too much overclocked
As requested. I find it strange that I have such a variance in temps...or is that normal?
http://i61.tinypic.com/avodp3.jpg