Sorry, was out for a bit, but as far as memory voltage, my bios settings have a max of 2.1V and the memory itself is labeled 2.3V ... also a full length memtest with all 6GB installed ran without issue, and there was nothing wrong. As far as memory timing, i was disappointed to find my bios maxes at 800MHz (i suspect this is hardware limited, not software), though it is PC-8500 DDR2.
Antman: I'm not sure if the Memory Voltage = the Northbridge voltage, I'm not sure what exactly the northbridge and southbridge connect, I'm more of a software guy than a hardware guy. I know there are four voltage settings aside from the memory, but i couldn't tell you what did what, so I've never messed with them... I'm not exactly a seasoned veteran of computer building, i pretty much know where to plug what and that my PSU is probably stressed by my system.
I'm getting as far as the "Windows is starting..." screen with the animation and it goes to black, which it normally does before the mouse pointer appears a few seconds later, but the system hangs on that black screen instead.
As far as Specs:
AMD Athlon X2 4200+ 2.2GHz
Asus M2A-VM motherboard
NVidia 8600GT 256MB gpu memory 768MB shared system memory
Kingston 2x2GB DDR2 PC-8500 (new ram)
Buffalo Select 2x1GB DDR2 PC-5300 (old ram)
I'm probably going to be getting a new motherboard soon, so for now I'll just run with 2GB of the new ram. Ubuntu and DamnSmallLinux both detect and use all 6GB when I have them in, so I know its something with Windows 7 that is probably having driver
or compatibility problems with my setup.
Edit: I bought the ram as two individually packaged single 2GB sticks, I don't know if that is any different than a 2x2GB "kit", but even so when the ram was placed so that it ran two individual single channels and as one dual channel set, or even with the 2x1GB set and 1 of the 2GB modules, windows never got passed that screen unless I had 3GB or less installed. Dunno if that is relevant, but I guess its good to say.