Question Why does my PC crash only while gaming

Update your post to include full system hardware specs and OS information.

Include PSU: make, model, wattage, age, condition (original to build, new, refurbished, used)?

Disk drive(s): make, model, capacity, how full?

List all attached peripherals.
 
check to see if a minidump is created.
if not, check the rating for your power supply and the required power to your GPU.

if the gpu pulls too much power, the motherboard protection circuits can go off and reset your cpu (and no minidump will be created)
note: there are common driver issues that can also cause this problem. you would have to supply a minidump to detect this.
if you do not have a minidump from a bugcheck, you can force the a working system to produce one. google how to make windows produce a memory dump using a keyboard. then make the registry changes and make a minidump of the working system. You then would copy the file to a cloud server, share it for public access and post a link. Someone with a debugger can take a quick look for overclock driver issues. (more than one copy)

be sure to check the connections from the PSU to the GPU. Sometimes the connector gets messed up and the GPU does not get full power. also check the speed of the fans on the GPU. if the GPU overheats, you will get the same symptoms as a poor power supply. (hot electronics use more power, then produce more heat, then use more power, until something stops it. most often the motherboard protection circuits on a good motherboard. Cheap motherboard will just let your GPU slot melt and catch fire.

i have seen gpu fans clogged with dust and the fan pops off the motor shaft. motor still spun but the fan did not move.
 
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Update your post to include full system hardware specs and OS information.

Include PSU: make, model, wattage, age, condition (original to build, new, refurbished, used)?

Disk drive(s): make, model, capacity, how full?

List all attached peripherals.
I've had this PCU for 6 years now. But before i had it my cousin used it in one of his PCs, and the D: disk is brand new(bought it 2 months ago). I think everything is there now, if you need anything more info write back. SPECS
 
A six + year old PSU is a likely suspect. Make, model, wattage?

May be at or nearing its' built in EOL (End of Life). Especially with a history of heavy gaming use.

Look in Reliabillity History/Monitor and Event Viewer for error codes, warnings, and even informational events being captured just before or at the time of the crashes.

Increasing numbers of varying errors are a sign of a faltering, failing PSU.

If possible swap in another known working PSU with higher wattage.

Determine if the errors stop or decrease.

Make notes of the errors codes and descriptions being logged.
 
A six + year old PSU is a likely suspect. Make, model, wattage?

May be at or nearing its' built in EOL (End of Life). Especially with a history of heavy gaming use.

Look in Reliabillity History/Monitor and Event Viewer for error codes, warnings, and even informational events being captured just before or at the time of the crashes.

Increasing numbers of varying errors are a sign of a faltering, failing PSU.

If possible swap in another known working PSU with higher wattage.

Determine if the errors stop or decrease.

Make notes of the errors codes and descriptions being logged.
I put the info in the url TEXT "SPECS" you can see the model there
 
3 suggestions:

1) Check for error codes, etc. via Reliability History/Monitor and Event Viewer.

2) Ensure that all important data is backed up at least 2 x to locations away from computer in question. Verify that the backups are recoverable and readable.

3) Power down, unplug, open the case.

Clean out dust and debris.

Verfiy by sight and feel that all connectors, cards, RAM, jumpers, and case connections are fully and firmly in place.

Use a bright flashlight to look for signs of damage: bare conductor showing, melted insulation, kinked or pinched wires, loose or missing screws, cracks, moisture, corrosion, browned or blackened areas, swollen components,

Replace the CMOS battery - follow the procedure provided in the Motherboard's User Guide/Manual.

If the crashes continue then the next step would be to swap in a known working PSU. Be sure to use only the cables that come with the swapped in PSU.