Lightman, are you doing all this on your DQ6 mobo?

When mine was replaced I fired it up went into bios for about 5 secs - Freeze.

Now when I go into the bios I do whatever I have to as fast as I can and try to save it before it freezes. Sometimes I have to reset 5-10 times just to set a voltage. There is no way I can go in and twiddle around with ram timings or anything that takes some thinking over.
But in windows (Vista 64) it's as stable as a rock.

Just wondering if it might be the motherboard My 1st one didn't play up like this.

I see you're going to try a K9A2. I would be interested to hear the result.