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memset will allow to do these settings. But it is always better to have it in BIOS.

What memory ratios worked best for you ( above 333 and below 333 ) ?

For me, above 320, 1:1 and 4:5 are the only ratios which seems to be stable. But this is with RAM underclocking. Below 320, I...

Somehow I am seeing core voltages from 1.20V and I am running my proc at 1.21 V.

Can you give your current BIOS settings? What is your stable overclock with QX9650?

VFSB must not go beyond 1.3 for 45nm as it may destroy the CPU.

ICH voltage can be auto. or 1.05

Also enable SPD initially and try.:up:

Try different RAM ratios and those which are closet to your required speed.
1:1 , 4:5 works usually as they are in 1066 strap. None of 800 strap ratios work for my QX9650. I think 1066Mhz on your...

What is FSB : DRAM? What FSB ? Are u overclocking?
U can try changing ur RAM ratios.
Did u try both modules separately?

Check your RAM with Vista's Memtest utility at bootup.

By anychance...

C1 stepping for QX9650 is supported. I got that for Asus tech support.
Qx9770 is not supported.

Another finding..

Initially I had Vcore in BIOS starting from 1.5 . I then used AI booster to set a voltage below 1.5v. After this, BIOS showed voltages starting from 1.2 volts.

Same here. With my mobo, all I can do right now is 320 Max. Beyond that if I disable 2 cores, I am able to go past 333. What a trade off :)

I tried various combinations of FSB voltage / MCH v ,...

How can a stepping difference cause issues with Mobo?

according to Asus web site only C1 stepping of Qx9650 is supported. But I use C0 and it seems to be OK ( with a tad bit lower FSB ).

I was running FSB at 333 with Auto volatage for MCH. Also my Vcore starts only at 1.5V

What max MCH voltage is safe on this mobo?

Found the issue! It was to do with FSB speed. Reducing it by 10 worked.

But I have another issue.. I dont know if it is a issue.

HW monitor shows CPU temp as 17C for one of the cores! Can it...

I recently got a Quadcore QX9650 C0 step. I reinstalled Vista 64 after swapping it with a core 2 duo.

now the problem is that with only 2 cores enabled, Super PI completed 32M without errors....