Crashing In-Game - AMD AM3+, GTX 1060

[LucaFire]

Hello, friends. Trying to get some help for a friends PC.

Specs:
CPU - FX-6300
GPU - GTX 1060
RAM - 8Gb (2x4Gb)
Mobo - Unknown (will attempt to Identify this weekend)
PSU - Unknown (refer to Mobo)
OS - Windows 10 (Specific Edition Unknown) 64-bit

Problem: A few months ago, when the system had been equipped with a GTX 950, there was consistent crashing in-game, but only in-game and quite frequently. Normal browsing sessions went undisturbed. A couple months ago, my friend changed out the GTX 950 for a GTX 1060 but didn't use DDU for installation. Following this, the crashing from associated with the previous card continued - only in-game, never browsing. It's also important to note that the crashes occurred more quickly on more intense games.

• 
  I went and used DDU, but crashes still occur.
  I pulled out the sticks of RAM and played only using one at a time, both crashed, although one crashed much faster than the other.
  I scanned using the built-in Windows memory test tool but it didn't detect anything (Important Note: will be running MemTest86 this weekend off an iso formatted disk to ensure the sticks are clean)
  I used Malwarebytes to scan the system - only minor malware and PUPs were detected and subsequently removed
  Clean Installed Windows - Still Crashes

Important to note that upon the clean installation of Windows, the crashes subdued to only occurring every few hours, but they sped up and are now back to usual crashing status at every few minutes the game crashes (every game thrown at it including: No Man's Sky, XCOM2, Starcraft, Hearts of Iron IV, etc.).

Any recommendations welcome! Thank you for the help!

 

[DSzymborski]

Sudden crashes at load without a blue screen tend to be either temperatures or power supply. If the temperatures aren't the issue, I'd suspect the power supply, especially if it's a low-quality one.

 

[LucaFire]

Sudden crashes at load without a blue screen tend to be either temperatures or power supply. If the temperatures aren't the issue, I'd suspect the power supply, especially if it's a low-quality one.

Thanks, will definitely check both. I completely forgot that temps were a possibility... especially with the FX-6300.

 

[LucaFire]

If it turns out to be the solution, will select your answer.

 

[LucaFire]

Sudden crashes at load without a blue screen tend to be either temperatures or power supply. If the temperatures aren't the issue, I'd suspect the power supply, especially if it's a low-quality one.

Update:
Ran MemTest86 two Times (general test) with zero errors appearing.
Checked the PSU - EVGA 600W 80+
Temps are low and/or not excessively high - 45C for FX-6300, 76C on GPU (both under load)
Replaced the GPU (switched from the GTX 1060 to theGTX 950 that had been experiencing similar issues) (while running DDU before installing either card) and still experiencing crashes
XCOM2 crashed and showed two errors:

• 
  DirectX11 error
  "Pure virtual function being called while application was running (GlsRunning == 1).

Resat the RAM, GPUs, PSU sockets while cleaning out dust

Will run Prime95 tomorrow morning for a few hours (Blended program) and see how it goes.