System will rarely not POST after restart

[milfordcubicle]

Hey all. New here. I have an unusual problem. I have oc'd the cpu, gpu, and memory on my new machine. the specs are as follows:

q6600 @ 3.2ghz (8 x 400), vcore 1.44v
4 gb g.skill ddr3-10666 1333 (9-9-9-24) @ 1600mhz (10-8-8-20)
ati radeon 4870 1gb @ 780mhz cpu/1070mhz ram
500 watt rosewill psu
500gb samsung spinpoint 7200
Gigabyte GA-EP45T-UD3P

After fine tuning everything, ive finally got everything working nicely. 3dmark06 runs fine scoring 15800, prime95 ran clean during a two hour run, and I can game on it for hours on end. my idle temps on the four cores range from 26-30, never top 43 during games, and peaked at 57 under prime95.

But, every now and then (only happened maybe three times), usually during a restart, the computer will shut off, then back on, and when i go into the bios, it says there was a failure due to overclocking/voltages in the bios. nonetheless, i'll keep the settings as they were and reboot with no problems.

my case (antec 300) did not come with a speaker so i can't get any audible errors.

the computer has never shut off under load or when idling (except when i was testing vcores and prime95 posted errors due to too low of voltage, led to BSOD, bumped up vcore, passed).

i've monitored my voltages from the psu and they have always been very stable.

i built the computer about three weeks ago and it has been working perfectly, except for this occasional mishap. It doesn't appear to be much of a harm, but i was wondering if you all had any ideas.

thanks.

 

[caniba]

It probably the PSU. Sorry man but you have a great system and trying to run it with that crappy rosewill makes no sense. It probably is not providing consistant power on boot up and freaking everything out. Plus you are really pushing the limits on that build with a 500w PSU. Consider the Corsair, PC Power and Cooling or antec 550 to 650 range.

 

[milfordcubicle]

thanks for the reply. i was afraid of that. i will look into it. that psu wasn't too expensive so i wouldnt be out that much money.

one thing i did notice is that my vdimm for my ram was at 2.17v, while the default range for that ram is 1.5-1.6. the ram never gets too hot and survived multiple sessions of prime95, but i figured that voltage would fry it eventually. so i dropped it to 1424mhz and was able to tighten up the timings to 9-8-8-20, and didnt notice any significant change in benchmarks. the voltage for the ram now is 1.74, still above range but i'd be surprised if i ever fry the ram at that level. i also dropped the vcore to 1.39 after dropping the fsb to 356 and increasing the mulitplier to 9 (my particular cpu can be temperamental with voltages), while still maintaining the same clock speed.

the system appears to boot up more consistently now, so it's possible the error could have been memory/voltage related. i'm considering a crossfire setup in the future anyway so i should start looking for a stronger psu.

thanks again.