Question

Permanent FPS drop while playing any game

CPU: AMD FX-8120 Eight-Core Processor (3.1 GHz, 16 MB)
CPU Cooler: Coolmaster Seidon 120M
GPU: Gigabyte ATI HD7870 OC 2GB 256b DDR5
RAM: DIMM DDR3 8GB 1600MHz Kingston (Kit 2x4GB)
HD: SEAGATE Barracuda 1TB SATA/600, 7200RPM
MB: Gigabyte 970A-DS3 970 AM3+, DDR3, SATA3
PSU: SEASONIC (Energy Knight) SS-500ET

OS: Microsoft Windows 7 Professional Edition Service Pack 1 (build 7601), 64-bit
BIOS: Award Modular BIOS v6.00PG

So let's get right to the issue. I start up my computer, load windows - everything is fine and smooth. Doesn't matter what I play, it could be Skyrim or Minecraft. The game runs fine for around 10 minutes with proper FPS. Then it suddenly drops to 1 - 20 FPS and stays there for the entirety of my gameplay. I quit the game and whole computer is laggy for certain period of time (until it cools I suppose).

In summer FPS drops much sooner. I played in winter, it was cold outside and my FPS dropped. So what I did is I opend the window to let the cold air into my room and the computer was fine the entire time. So from this information I assumed I have cooling issues but CPU temperatue stays below 50°C as well as GPU. And I even swapped fan CPU cooler for a water one - didn't work.

I don't have means to try and swap out all components one by one to detect the bad one.
Ask me anything and thank you for your answers.

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Comments
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Answer
Your tests point to heating issues.

Did you try a good canned air cleaning?
Do all fans look to spin at good speed? (that is, they look like they are spinning like new?)

The CPU is only part of the puzzle but for me the GPU is where all frame rate issues start and end unless there is something very wrong elsewhere.

You did fine with your testing but I don't see any mention of cleaning or case cover off testing.

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Cleaning

I did try case cover off but it was even worse. With cleaning - I of course vacuum-clean the outer fan now and then. I also think its the GPU issue but the temperature is fine. I just dont understand why its sudden drop. I thought if it continuously heats up fps would drop acording to it.

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My best guess is the HD7870

That card showed up in 2012 and it could be failing in some way.

The case cover off worse could indicate heat again as while most of the time cover off wins, in rare situations it can make it worse (rare.)

You didn't tell me about all the fans. I worry that an old GPU could have an old slow or dead fan.

Without seeing the PC I'd recommend the GPU be replaced with something like the #1 seller Nvidia 1050 at https://www.amazon.com/Best-Sellers-Electronics-Computer-Graphics-Cards/zgbs/electronics/284822

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Change the Case?

So do you recoment for me to buy more suitable case eg. with side fan.
GPU has 3 smaller fans from bellow and of course the side heatsink.

Also do you think 50-60 degree celsius is bad for both CPU and GPU?

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Nope. Try another GPU.

As to the temps, they look normal but the age of the GPU and the symptoms tell me it may be failing.

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I will give it a go

I might be able to get my hands on aditional GPU so i can try swapping them and testing if the issue is solved

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Answer
No discrete video card?

Just using the FX onboard video with it? If heat, then need to replace the thermal paste under the heatsink. That's a "hot" processor, needs strong cooling.

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I got the strong cooling hopefully

I did change the paste cause i thought i did it poorly before and installed water cooler. CPU temp wont got above 55 degree C. I also dont understand the issue with onboard video.

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Updates
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Answer
I reread and can't see response to FAN questions.

I worry the GPU fan and heatsink need work. Actually at this many years a total re-do of heatsink cleaning, new compound under all heatsinks and fan checks (all fans) would be my first order of business.

The clues all point to heat buildup but has something slowed or failed? Only a few ways to tell.

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