Thats one big thread you have got there.
You probably have 2.5V (unless you have changed it previously) in BIOS as thats standard for DDR. According to the site you provided (hopefully this is your exact RAM), it states that it operates stably between 2.55-2.65V. Firstly I would like you to up your RAM .1V and see if your computer is then stable, if this doesn't work add another .05V. So you'd be effectively raising the voltage a total of .15V which would bring the total to 2.65V.
Next, do the freezes occur when you put your computer under stress? Has this CPU ever been pre-used or overclocked?
Edited by james_8970, 06 October 2007 - 10:38 PM.