Okey .. i have this box:
Motherboard P5Q3
CPU: Q9550
Memory: A Data DDR3 2 x 1 GB 1600 Mhz ...

i installed slackware 12.1, 12 and 11
all 3 crash after some hours of uptime ... after manually restarting the box from the button everything is good for another 4 .. 5 .. 6 hours

i only have bind, sendmail, apache & sql ( xampp ) running on the machine.

Anybody have any ideeas ?
I heard that the motherboard has a chipset that is not supported ..
What chipsets are supported for slack 12.1 that go with my Q9550 CPU and DDR3 memories ?

I verifyed the Memory with memtest and everything is good.