Graphics card causing hard freeze under load?

Textbook_Case

Commendable
Sep 25, 2016
3
0
1,510
First PC build here, sorry if I miss a term.

When I first got everything set up, I had some issues where my screen would randomly freeze for about a minute and shut down. I reinstalled the OS, Windows 10, and the problems stopped. I installed the drivers and Steam and downloaded Fallout 4. Less than a minute after loading the world, the screen froze and the machine shut down. I performed a clean install of the drivers, checked hardware connections, and tried just about everything I could think of, but nothing worked. I noticed that even under load, the graphics card (GeForce 1060 Windforce) fans weren't switching on. After looking for a solution and triple checking my hardware, I ordered a G1 1070 to replace it, figuring that I had gotten a defective card. I installed the new card, made all the connections, installed the drivers clean and tried Fallout again. After about 5 minutes of perfectly smooth gameplay on High graphics, I had a hard freeze. Alt+tab, Ctrl+alt+del were unresponsive. I waited for a few minutes expecting the machine to shut down, but it didn't. I eventually turned it off with the power button and rebooted. After trying again with Dishonored, same issue. I rebooted again and found that my graphics drivers had disappeared. I've tried checking connections, switching RAM slots, checking standoffs and reinstalling the OS. What am I missing?

Specs:
Intel Core i5-6500 3.2GHz Quad-Core
Gigabyte GA-B150M-DS3H Micro ATX LGA1151 Motherboard
2x Mushkin Blackline 16GB (2 x 8GB) DDR4-2400 Memory
A-Data Premier SP550 480GB 2.5" Solid State Drive
Hitachi 2TB 3.5" 7200RPM Internal Hard Drive
Gigabyte GeForce GTX 1070 8GB Windforce OC Video Card
SeaSonic 520W 80+ Bronze Certified Fully-Modular ATX Power Supply (315w used according to pc parts picker)
 

maxalge

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are you monitoring temps for both the cpu and gpu while gaming?
 

Textbook_Case

Commendable
Sep 25, 2016
3
0
1,510


I am. They never rise above about 90 degrees C.
 

maxalge

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>.> if they are hitting 90 degrees then there is your problem
 

Textbook_Case

Commendable
Sep 25, 2016
3
0
1,510


I'm using an NZXT H440. What can I do to improve cooling?