1. Flash BIOS to the latest 11...dated 5/24/07
2. Go into BIOS and set FSB to 300MHz, 9x multi, memory divider to 1:1, Vcore to 1.400, Vdimm to 2.0, and memory timing to 5-5-5-15. Leave all other settings at DEFAULT! Save and exit BIOS.
3. If PC boots into windows, then use CPUz to confirm that memory speed = FSB speed (1:1) and RAM timing is 5-5-5-15. You may see Vcore around 1.1 since C1E and EIST are enabled. That's normal.
4. Raise FSB by 5MHz and see if you can boot into windows. If okay, then continue to bump up FSB by 5MHz until PC will no longer boot into windows.
5. Return to BIOS and back-off FSB by 5MHz. PC should boot into windows.
6. Run Orthos Large mode for 10 minutes. If okay, then raise FSB by 1MHz and retest using Orthos. There's no need to run Orthos for more than one hour. If system is unstable down the road, then you can drop your FSB by 2 or 3MHz.
7. Now raise the memory divider to 1:1.20 or 1:1.25 if you want to overclock RAMs. Run memtest86 (test #5) for about one hour.
The goal is to keep your max CPU temperature 25C below the Tjunction temperature as shown by CoreTemp 0.95 when crunching with Orthos. USE THE LOWEST VCORE AND VDIMM to achieve system stability. You should be able to run the RAM at 1.8V up to 400MHz FSB.
A good chip with good cooling can handle up to about 1.465Vcore.