My new built PC freezes when I play any game

Dec 23, 2018
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I built a new PC with a Gigabyte Z370p D3 mobo i7 9700k and 1080. But every time I play a game the pc locks up(freezes) even though all the fans are still on, so I thought my PSU was the problem so I brought an 850w EVGA PSU and installed it but the PC still freezes so my PSU isn't the problem and I did a fresh install of windows so that isn't the problem either. Please, someone, help me is it a faulty mobo or CPU? As just want to use my new parts.
 
Dec 23, 2018
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Dugimodo

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And the memtest?

Is this in any game, or just a particular game? Does it lock up completely and have to be rebooted or is it just the game that crashes?

Also you could remove the graphics card and test it with just onboard graphics, it won't be any good at games but just as a test to see if it freezes. And on that note do you have both power cables connected to the GPU and the 4 or 8 pin power connected to the motherboard?
 
Dec 23, 2018
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Yeh I did a clean install of windows and my ram is fine as I'm using it now in my old set up for the time being and I have no problems. Also it doesn't crash the pc locks up the screen freezes and the only option I have is to reboot the pc. Also I will do the mem test when I'm at home. Also its not the GPU as I tried my 1050ti aswell and the pc still crashes.
 
Prime95 (run small FFT test) - https://www.mersenne.org/download/
Memtest86 - https://www.memtest86.com/
3D Mark demo - https://benchmarks.ul.com/
Unigine benchmarks - https://benchmark.unigine.com/

To test the CPU run the latest Prime95 small FFT stress test. 30 mins will give you basic stability. 4 hours will give you 99% stability.
The newer Memtest86 free version only lets you do 4 passes (I think). But 2 passes is good enough to assure 99% stability.
The latest 3D Mark Time Spy demo is very good at bringing a video card to its knees but it doesn't loop. Loop Unigine's Valley benchmark for 30 mins to get your card all nice and toasty and then run a few Time Spy demos to assure stability.

Whichever test your system gives crashes, warnings, lockups, reboots, or problems in will tell you what component is having issues.

Are you doing any overclocking, timings adjustments, and/or voltage adjustments?
 
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