GTX 970 GPU Usage Dropping Along with FPS ~20 minutes after restart

[andyrox415]

This issue arose around 4-5 days ago and I haven't found a solution since. Basically, when I have just freshly started my computer after having it turned off for a while, I will be able to enjoy high fps (~300-400 fps in CSGO) in my games. However, after playing for around 20 minutes, my FPS basically plummets to 30-70 fps.

Looking at MSI Afterburner, for some reason my GPU usage drops from 30-40+% to less than 10% in this time.

Does anyone know what the cause of this is and what might be a possible solution?

SPECS (from speccy):
Operating System
Windows 10 Home 64-bit
CPU
Intel Core i5 6600 @ 3.30GHz 20 °C
Skylake 14nm Technology
RAM
8.00GB Dual-Channel Unknown @ 1064MHz (15-15-15-35)
Motherboard
MSI B150 GAMING M3 (MS-7978) (U3E1)
Graphics
Acer H236HL (1920x1080@60Hz)
4095MB NVIDIA GeForce GTX 970 (ASUStek Computer Inc)
Storage
232GB Samsung SSD 850 EVO 250GB (SSD)
931GB Western Digital WDC WD10EZEX-75M2NA0 (SATA)
Optical Drives
No optical disk drives detected
Audio
NVIDIA High Definition Audio
Power Supply
Corsair CX600W

MSI Afterburner log showing GPU usage drop and following fps drop:

http://imgur.com/a/bAato

CPU Temps were all normal (20-24 C)

edit: added hwmonitor page while ingame

http://imgur.com/a/RnoGQ

On second look appears CPU core speeds are abnormally low. Anyone know what might be the cause of this?

 

[kunal_1991]

If you have this problem only in cs go, try this:

https://m.reddit.com/r/GlobalOffensive/comments/41sjz1/timer_resolution_fixed_fps_drops/