Upgraded from AMD Opteron 6128 to 6272 - PROBLEMS!

Hopefully you guys can give me some pointers.

I just swapped out two Opteron 6128s from a Windows 7 (with SP1) system that was running fine. I replaced them with two 6272s.

The Asus MB POSTed just fine. I got my Windows splash page, but as soon as it is about to load the desktop, it reboots.

Then it goes into the "run system repair" message from Windows. I say, sure, why not. But THAT ends up rebooting before it actually does its thing.

Then I have the computer boot from DVD to my Windows Ultimate DVD to do a fresh install. It loads, gives me the little progress bar thing at the bottom. And then JUST as it's shows the mouse arrow and is about to load the user agreement page, it reboots.

I have the latest BIOS (v2006) on the MB.

Any ideas? The computer gets through POST just fine. Seems to be a Windows problem. ???

Well, maybe it's not Windows. Something else is going on. I cannot load my Linux Ubuntu or Windows XP. Same thing happens right around the same time for both.

In Ubuntu I got an error message that displayed, but it wasn't on the screen long enough to write it down.

They all seem to be forced to reboot just before loading the desktop.

Any ideas where to even start trouble shooting?

Thanks. I did that in another computer and things are just fine.

I can't even load Ubuntu from the DVD (no hard drive involved).

??

Have fun rendering in cinema 4d! How much would one of these systems cost?