Msi nf750-g55 System Randomly Shutting down.

Question

Hello everyone, Back in April of this year I built a system through newegg with the following Specs:
Motherboard: MSI NF750-G55
Processor: AMD Phenom II x6 1090t (with stock heatsink)
RAM: Corsair x4 2GB DDR3 1333
Power supply: Cougar 700W Sli ready
Graphic Configuration: two MSI Geforce 460 Cyclone GTXs running in SLI
Hard drives: 1 WD 300GB VolociRapter and a WD 500GB mybook removed out of its external
Operating System: Windows 7 Ultimate 64bit
Not long after I built the system (before I even thought of overclocking it) I began having a serious yet vague issue: It would shut down randomly. And I mean very randomly. Sometimes it occurs once every couple of hours, and other times it doesn't happen for more then a week. It doesn't seem to matter what I am doing on the system either. I could be playing games, or just listening to music and it will still happen, so I can't imagine its related to load. Its been a long, painstaking process to try and fix. I ruled out some of the parts it could be though. I have replaced the Power Supply with a higher quality model and an extra 50 watts, checked the temps on the system for a number of weeks while idle and under load (all looking cool except MCP), ran memtest86 successfully for a full 24 hour with no issues, as well as re installed windows 7 once. Issue still occurs.
To be perfectly honest I am not really sure where to go from here. I purchased all my parts through newegg, so I am confident I could RMA the component that is experiencing failures if that is the case, but there in lies the problem: I am not sure which one to RMA! I don't have a means to swap out parts, as no one i know has a system with a similar configuration as me.
I am suspicious of the Motherboard along with the processor, which is why I am posting in these forums...
Any ideas or suggestions as to how I could either fix the problem through configuration or pinpoint which hardware component is causing these random shutdowns would be much appreciated! I really don't want to run the risk of damaging any of the other components...

Answer 1

Swapped out my first 460 with my other one after 2 consecutive shut downs in 1 hour... haven't been around to continue working on it until recently, but atleast its looking like it isn't my cards.
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it doesn't matter, software voltage measure isn't accurate you can't trust them.
If you want to check voltages [use multimeter],
or best test with another well known working and powerfull enough quality and single rail PSU
I got a question, why would single rail or multi rail make a difference? I hear the only reason they split the rails is for protection... and if both my PSUs are SLI ready, why are my components drawing too many amps?
So I guess its time to shell out another 100 - 150 bucks on a PSU... Can't say I'm thrilled. Looking for one with a single 12v rail. My question is this, would this single rail power supply meet my needs?
http://www.newegg.com/Product/Product.aspx?Item=N82E16817153127&cm_re=single_12v_rail-_-17-153-127-_-Product
And if not can you or anyone make a recommendation(s)? Thanks!
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As for the AMD standard paste, sorry but I remove that instantly and add my own itty-bitty-tiny drop of grease and smear it so thin you hardly see it.
Too much paste can cause this too, and yes I consider the AMD amount too much.
Heck without paste it will do a better job then the AMD amount, the CPU has a heat-spreader and doesn't need that much.
But, it could also be your heat-spreader is broken, as such CPU-temp-readings will reveal that.
Well, so far I've seen no problems with temps. The shutdowns don't seem to indicate that heat is a problem too. I can start the system immediately after a shutdown, it doesn't matter what I am doing on the system to make the shutdown occur, and my peripheral devices are sometimes still powered after a shutdown (such as caps lock on the keyboard).
Also, hardware monitor shows it idling at almost room temperature in the post above lol. Under load I think about 38 - 40c from what I remember seeing. I'll post a load temps pic after a few hours of torture testing tomorrow.
Also, I may have only personally built one other computer from scratch, but I have done quite a bit of troubleshooting, as well as assisted with other people's builds. Now I am not calling myself an expert by any means, but all that being said I have yet to come across or even hear of a CPU heat related problem where there was too much thermal paste on a stock heat sink... lol learn something everyday.