My graphic card is not functioning properly as it should be

Jun 5, 2018
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Specifications:
CPU - Intel Core i3-530 @2.93 Ghz
GPU - Gigabyte GTX 660 Windforce
Memory - 8GB DDR3 1333 (2x2gb & 1x4gb)
Hard Drive - SATA 7.2k RPM 1TB
PSU - FSP Non-Modular 500Watts

Recently i've been having issues on my graphic card. I can't play games normal anymore since i've been having frame rate issues. Usually i play games at normal fps but now i can only play games not reaching at least 25 fps. At first the fps returns to normal when i reseat the card but as time passes by it returns to its problem. Also, sometimes my keyboard, mouse and monitor is powering off and on (intermittent lockups i presume).

Games i play:
Rise of the Tomb Raider - Normal Quality (60fps ave) 15fps average now
League of Legends - Ultra High Quality (60fps ave) 45fps average now
Little Nightmares - Ultra High Quality (60fps ave) 15fps average now
Fortnite - Normal-High settings (60fps) 20fps average now

Things i tried:
Reseating GPU & RAM
Cleaning the GPU
Reinstalling the driver (updating and rolling back too)

Here is my GPU-z sensor
https://imgur.com/a/BGgNGIH

 


I installed MSI Afterburner on my pc and monitored the temps, same temps as GPUz
 

What is highest temperature's been recorded by you?
What windows do you have? Personally, I would check out the condition of HDD and then replace windows with upper - 10, or lower - 8.1/7 version. Supposedly, your problem is associated with software issue, not hardware one, at least I hope so.
 


I played Rise of the Tomb Raider for like 2hrs a day at max and getting 70-75 degree celsius of temp (max), when idle the temps at 30-40 degrees celsius

2 days ago it went back to normal, my friend suggested me to replace the thermal paste the next day, the next morning the issue went back, so i applied a new thermal paste on it but the problem still persists.

Here is my GPU-Z capture http://gpuz.techpowerup.com/18/06/07/p5w.png