FPS problems

[Merkurija]

Hello all,

Over the past I'd say month or 2 I have been suffering poor FPS (For the GPU I have) and I am noticing this the most in League Of Legends. I also feel FPS drops on Genshin (SOMETIMES) and streaming games takes a noticeable hit of about 30 FPS on some titles like Overwatch. I have reinstalled windows completely and it did seemingly fix my FPS problems for all of a week or 2 and then the problems came back, but I think reinstalling windows was just a pseudo fix.

PC specs:
Windows 10 Home (on an SSD)
MB: Asus prime b550m-a
GPU: RTX 3060 Eagle OC
CPU: Ryzen 5 3600 (It has overclocked itself to default at 4Ghz).
PSU: BeQuiet silver 80+ 650W
RAM: 2 x 8 3200 Mhz Corsair Vengance (Running at 3200 Mhz)

The system is water cooled, never exceeds more than 70 degree on a hot day, to begin with I thought my GPU might be defective... I am unsure as of now because I have a spare 1050Ti laying around and it was randomly running as good as the 3060 but I just tried it again and it is noticeably worse (as it should be). My thoughts now is this may be potentially a motherboard issue because my motherboard is the oldest part of my system along with the cpu, psu and ram and it is the cheapest. All games mentioned are being run off a WD Blue hard drive.

I can't think of what other information may be relevant so if I have missed something just ask I probably know what it is