Try prime95 blend test. i've got the same setup and had problems like you.
Remove 4 gig for testing.
Up the volts on the core to 1.35, ram 2.1, nb 1.36. fsb term 1.6/7
I'm running the default blend test now, if all is well i'll open my box later and remove some ram and retest. If nothing then i'll mess with the voltages.
Edit. Are those suggested voltages for testing or for normal running? I haven't overclocked my RAM if that make a difference.
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