[SOLVED] Intel quad core crashes randomly

[Joseph_sys]

I have a Intel Quad core that crashes randomly, there is no pattern.
I've run three passes with "memtest86+" no errors, I've run some "cpuburn" test no errors.
lm_sensors have it running, all CPU's temperatures are between 39C to 43C

Here is my hardware list. I don't know what to do next.
The guy the sold me the system suspect the problem is likely in kernel or libs.
But this is his opinion.

[Hu]

Could you elaborate on what you mean by a crash? Does the kernel panic? Does the machine suddenly lose power? Does the system just freeze, rejecting all further input but still showing its last output?

[Joseph_sys]

The computer suddenly reboot itself for no reason, no error messages no nothing, just cold reboot as if you pulled the plug OUT and IN. Sometimes I don't do anything not even touching the mouse and the computer goes for reboot in front of me reading the screen.

I have:
Power supply: Sparkle Power SPI600GLN
Motherboard: Intel Quadcore 2.83 BX80569Q9550

I know for those hardware guys blaming software in a easy way out, he is question me for reason using Gentoo etc. but I have all my boxes (5-of them) running Gentoo and not a single problem with rebooting itself.

[darkphader]

Problems like that do tend to be hardware related. It could be software but if I was a betting man my money would be on a hardware problem.
Maybe you could run from a livecd for a while (although it may not stress the system the same way). It's a lot like a memory test. If running from a livecd fails then you know it's hardware. The opposite, however, is not necessarily true (it doesn't mean it isn't hardware if a livecd doesn't fail).
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[Joseph_sys]

I was running memory86+ test from livecd for several hours 4-6 hours and it pass.
But I do think it is a hardware related, how can I test power supply? by replacing it only?

[darkphader]

[Jaglover]

The thing with memtest is if it tells you your RAM is bad then bad it is. If it passes then it means nothing, your RAM still may be bad. If you have several modules try removing them one at the time and see if trouble goes away.
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[krinn]

agree with jaglover, even a ram module is good, i've seen many case where the module were running unstable on certain m/b (sometimes a simple bios update fix the thing), because of the module specs.
hihi worst, sometimes, m/b don't like a combo of things (weird things like you can use 2x2G + 2x1G or 4x1G or 2x4g but for some strange reason the m/b is know to fail with a 4x2G module...)
and a pro seller should have take care of that for you already, but like everyone, mistakes could happen, and it's easy for you to check that

->like asus says

[Joseph_sys]

SOLVED!
I remove tow stick of RAM (4GB) and the problem is solved.