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New upgraded gaming PC, unexpectedly shut downs

Last response: in Graphics & Displays
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December 9, 2013 3:58:52 PM

Hi good evening,

I recently upgraded my Gaming PC to play Battlefield 4 smoothly. I am testing the system in a Sharp LED HDTV 46" 1080p. I tried LOW and High settings, in 720p and 1080p.

Previously:
EVGA P55 FTW
Intel i7 LGA 1156 860
Corsair H50 CPU Cooling
G.Skill Ripjaws 4GB (2x2GB)
XFX Radeon 5770
Thermaltake ToughPower 750W
Cheap Keyboard/Mice

NOW:
SAME:EVGA P55 FTW
SAME:Intel i7 LGA 1156 860

SAME:Corsair H50 CPU Cooling
Corsair Vengeance 8GB (4GBx2)
Gigabyte ATI R9 270 2GB (I know that this one is PCI Express 3.0)
SAME: Thermaltake Toughpower 750W
G19 Keyboard G700 Mice

Now when I am playing for example in Test Range on BF4, it lags (even in low settings), also on online servers. FSX runs good. BUT on BOTH games that I tried in about 20-70min the computer just shutdown by itself. I put the EVEREST Ultimate edition and none of the CPU or VGA sensors go over 50C. All other temperatures are kept normal usually 37C.

Why my computer shutdowns unexpectedly?

Thanks!
December 11, 2013 9:15:33 AM

you connected the parts on your own?
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December 11, 2013 3:21:34 PM

yes I did, I have been doing this for 10 years now
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December 11, 2013 11:50:42 PM

i had a problem when i built my pc with the memory timings (cas , latency etc.) and it was shutting down. I had to manually set them through BIOS. It took me a month to figure it out. But i guess you have already done it?
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Best solution

December 12, 2013 4:28:21 AM

troubleshoot your psu...most random shutdowns are caused by defective psu
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December 18, 2013 6:11:24 PM

finally I realized that my 2yrs old PSU cannot handle the loads of new GPUs even that it is 750Watts.
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!