Could be different optimizations or different drivers, different ways the kernel utilitizies the cpu's to improve SMP performance...
I don't know, but it's worth checking out IMO. After all you've been banging your head against the wall and this would be a pitty if the PSU was the issue all the long.
Just pop the side off the computer, stick the probes into the leads of a spar power plug, if your lucky they will just sit in there by themselves and set the mutlimeter on the ground or table next to it and see if you notice anything over a half hour of putzing around with it.
PSU's have been a sore point for alot of people for the past couple years with manufacturers doing stuff like labling a power supply 250 watts when after testing it's obvious that it can only handle a 175 watts reliably for any length of time.
If it's intermitent and you can't identify anything in the software that occurs to trigger it, then it could be something as stupid as a inadquate PSU.
At 4.7 volts thats missing the mark by 6% of what a mainboard is designed to run off of, which is fairly marginal, but not horribe. Maybe when both CPU's click in, and the HD spools up to proccess something it has a voltage spike or drop takes that 5v rail down to 4.3v or something like that and the voltage to the cpu is fouled up enough to cause a lock-up. Who knows?
It's probably not the problem, but you could spend another couple months on it if you don't test for it and it realy is the problem. Don't realy know myself.
I don't know, but it's worth checking out IMO. After all you've been banging your head against the wall and this would be a pitty if the PSU was the issue all the long.
Just pop the side off the computer, stick the probes into the leads of a spar power plug, if your lucky they will just sit in there by themselves and set the mutlimeter on the ground or table next to it and see if you notice anything over a half hour of putzing around with it.
PSU's have been a sore point for alot of people for the past couple years with manufacturers doing stuff like labling a power supply 250 watts when after testing it's obvious that it can only handle a 175 watts reliably for any length of time.
If it's intermitent and you can't identify anything in the software that occurs to trigger it, then it could be something as stupid as a inadquate PSU.
At 4.7 volts thats missing the mark by 6% of what a mainboard is designed to run off of, which is fairly marginal, but not horribe. Maybe when both CPU's click in, and the HD spools up to proccess something it has a voltage spike or drop takes that 5v rail down to 4.3v or something like that and the voltage to the cpu is fouled up enough to cause a lock-up. Who knows?
It's probably not the problem, but you could spend another couple months on it if you don't test for it and it realy is the problem. Don't realy know myself.
I haven't gotten much done recently because of all of the rebooting 
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