PC reboots when playing games AND when using memtest86

Operating System

Windows 10

Computer Specs (PSU, GPU, CPU, RAM, Motherboard)

CPU: Intel i5-6600
GPU: ASUS Rog Swift GTX 1070
Mobo: ASUS Z170-AR
PSU: EVGA SuperNOVA G2 550W
RAM: G. Skill Ripjaws V Series 16 GB (2x8) DDR4-3000

Speccy Link

http://speccy.piriform.com/results/w2nSXxqGRUjxwFJgqpvjNmA

Description of problem

Whenever I play certain games (i.e. Star Citize, Dark Souls 3, Divinity 2), my PC will occasionally reboot. Memtest86 also leads to this issue. Hours of use for simpler things like Netflix, YouTube, Reddit, etc. do not lead to this issue.

When this issue began

A few weeks ago, playing Star Citizen.

Recurring issue

Yes

Date of purchase

I custom built this PC in Summer 2016 -- replaced mobo summer 2017.

Under Warranty

Some parts? Not sure.

Cause/Steps to recreate the issue

Games or memtest86.

What I've tried so far to resolve the issue

1) Cleaned my PC with compressed air.
2) HWMonitor while playing games to see if the temp got too high -- it didn't.
3) HeavyLoad to see if it crashed when stress testing the CPU -- it didn't.
4) Replaced the PSU completely.
5) Memtest86 -- passed 100% a few times but constantly resets during so not too reliable. I checked the logs to see if there was anything of note when it crashed but there didn't seem to be.

Submitted February 01, 2018 at 08:21AM by Peasant_2_0 http://ift.tt/2rRVAmc