Skybird:
If that's not your CPU temperature, or your GPU temperature, you need to check your memory.
Download Memtest86 and run that at the ms-dos prompt. You can also use just about any current version of Linux; Fedora, Suse, Knoppix, Overclockix, Ubuntu, Debian. All the Live distros (CD or DVD) include Memtest. You just run "linux memtest" at the command prompt, or choose "memory test" at the menu (such as with Suse).
Configure your memory to run "stock", and let memtest run for 10 hours or more. Don't bother with more than 24 hours. Overclocking instability will show up within the first 10 minutes. Defective ram can take 45 minutes to 10 hours, depending on the severity.
********** IF ALL THAT PASSES ***************
It's your PSU or it's your mainboard's voltage regulators. Capacitors (notably, electrolytic capacitors) since 2002 have dropped in quality. China and Taiwan don't quality-assure their production lines anymore, leaving it up to the OEM's to fail test their systems. If you ever RMA a component and receive a replacement, you can see the results of this business philosophy for yourself. You'll see Sharpie marker slashes across the majority of caps on that component (such as a sound card or video card), indicating that the troubleshooter marked each cap as "good" during rework.
Your mainboard's power regulators, and your PSU, heavily depend on eCaps to supply "clean" power. Unclean power will cause those same "blink outs" like what you have described.
With a 350w power supply, at 50 degrees centigrade, it's only going to be putting out 250w or less. Usually 175w. That same 350w PSU running it's switches at 25C will put out it's full 350w. This is partially why people buy 500w power supplies; at 45C "typical" running conditions, it's still going to put out 350w of power.
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So, you will need to swap out a PSU, first. If you can borrow someone's for a few days of testing, that's the cheapest route. If not, you need to "upgrade" to something with a higher 12v current rating.
If memtest ran good, then it's not your processors, so it is most likely your mainboard's caps.
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