I have bug that may be the same

amd64 4800 X2 (in SMP mode, on amd64 mode)
2 GB RAM nvidia GT 8600 mianboard GA-MA78GM-S2H
I was using compiz (I think its mostly disabled now - no 3d stuff in desktop) ; 
I use nvidia glx-new

Screen turns off (as in - no signal), computer totally freezes (keyboard, 
capslock, power button, sys-rq-B nothing works...)
It happened 2 times when I was watching youtube, 1 time just using desktop, 
during ~2 weeks.
Reported mine as 
https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.22/+bug/228417

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nvidia with compiz and with dual core freeze
https://bugs.launchpad.net/bugs/151382
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