stability probs

[spielburg]

just built my own pc have done this before without any problems.this one doing me nut in big time.
processor is amd 3000+
mobo gigabyte ga-7nnxp

the pc runs perfect at default settings but i have to set to 166x13 to get my proccessor recognized as being a 3000 now at this setting pc starts up ok and boots but will only run for a short period before it reboots itself any help would be very much appreciated coz i really wanna let this baby loose see what it can do

[TierraDelFuego]

heat is the first thing you should look at. check the temp of the cpu from the bios or within a supplied app if you have one. do you have thermal paste on the cpu, adequate fans, adequate psu for the job.

[spielburg]

thermal paste yep
550 watt dual fan psu
cpu temp 62 c
system temp 44 c
also going to install 2 extra fans tomoz

[spielburg]

anyone else have any info

[smokafatty]

if your temp is 62 at idle then I think thats kind of high.