On my system (see signature below) I recorded 1010W power draw on the power supply with a Kill-A-Watt during heavy 3dMark06 tests like the clouds test. So I would say no, 750W is not enough, and I have a Thermaltake 1000W sitting waiting to be installed when I have a minute (I'm going to put in a fixed drain plug too!)

Upgrade your power supply and my guess is it'll stabilize.

I am having trouble with the SMbus on the GA-X48T-DQ6. BIOS F5D, symptoms are:

1. Running cpuid.com HWMonitor 1.09 occasionally only shows the machine name and no data. Running it again almost always fixes it.

2. Running Everest 4.50.1330 while connected to the machine on Remote Desktop, with the OSD enabled for every 5 seconds, will eventually lock the machine up.

Anybody else experience SMbus related issues?