I can run prime blend test for 6h at 400mhz front bus. tried a large fft test at 410, fail after 4 hours. Temperatures never exceed 46C degrees. MB temp is ~35C. I run speedfan, coretemp and asus pc probe 2 in windows vista 32bit (installing 64bit next week so I can use all the ram).
Voltages in bios is set to auto (except ram). Is that ok? Do I manually need to raise the voltages or should I only start messing with it after I found my max stable overclock so I can try to reduce it?
I ran 6h blend test at 400fsb with no error, longest I've tried. Havn't been able to try lately due to lots of work to do. I can try a longer test today (at 400fsb), large FFT, as it seems they often stop the test.
I don't know if you can ignore the errors or not. When I get errors I fix it- that's how I roll, and it's what I recommend you to do for the sake of your investment. It's possible that Vista could have a hand in it, I dunno. 3.2 is a decent jump from stock speeds though and your system probably just needs a boost in voltages somewhere.
We've established that your system runs fine at stock speeds, and we've eliminated memory as the culprit here. I would raise North Bridge voltage in the smallest increments allowed. It's probably going to be somewhat time consuming, but start at the lowest voltage available when leaving auto and work your way up until you achieve stability.