Question Need help with my GPU - 2080 TI water cooled

[ReconRob]

The following image is from a HWMonitor recording after playing Hogwarts Legacy and OW2 for a little while.
I keep getting bad FPS even though my CPU works perfectly. Does anyone have any ideas?

CPU: AMD Ryzen 7 3700x (limits at max 70 degrees with 4100 MHz max clock speed)
RAM: 4 Corsair DDR 4, 30 GB total

I have a water loop but since my CPU is in the same water loop I expect that that is not the fault. Maybe it is the power supply or faulty cable? Any ways every tip is welcome!

https://imgur.com/EOt3jaP

View: https://imgur.com/EOt3jaP

 

[Aeacus]

bad FPS

What is "bad FPS" for you? 20 FPS? 40 FPS? 60 FPS?

but since my CPU is in the same water loop I expect that that is not the fault

It IS a fault.

RTX 2080 Ti FE (air cooled), goes up to 80C during gaming,
review: https://www.tomshardware.com/reviews/nvidia-geforce-rtx-2080-ti-founders-edition,5805-11.html

While yours, with open-loop and CPU in the mix, reaches 87C.
You'd be better off with air cooled GPU than it being in the loop with CPU.

Any ways every tip is welcome!

Reduce the in-game graphical settings (or play at lower reso) and look if your bad FPS isn't that bad anymore.

If FPS increases, issue is with GPU.
If FPS remains "bad", issue is with CPU.

 

[Eximo]

Given the low power and frequency, it is safe to assume the GPU is self throttling. Not because the CPU is necessarily in the loop, but because something else has gone wrong.

150W from a GPU is not much, and for it to still reach 87C on the core is very high.

Either there is blockage inside the GPU block, or the block is no longer making sufficient contact with the GPU die. Either way, complete disassembly is recommend to examine the block conditions, the loop condition, and the pump performance.