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my fps has been lowering on games after playing 2 hours of demo of dying light. Only little, like frame drops. :|
Does the rear of your PC case feel like hot static air?
It could be thermal throttling, due to overheating, if that's the case.
Ensure fans are clear of dust, still spinning (not blocked) and there's ensure space around the back for hot air to excape. If there's not enough space, sometimes hot air gets trapped there, re-entering the rear of the PC - which is where the graphic card is, therefore the graphics card fans increase in speed cycling around and around hot air without actually getting rid of it. It overheats, then FPS drop as it lowers the GPU clock cycle in an attempt to cool itself off and not fry. It's not the game itself fault, but heavy graphic intense games will trigger it off, as the graphics processing is a higher load.
If it keeps doing it - attempt running the PC with the case side panel removed to ensure a higher airflow inside and seeing if it still occurs or not.
the speed did increase when i play heavy games
unless your overclocking and overheating the gpu but that not the games fault
Most likely the cause is overheating then...
Get a can of compressed air from a computer store - it's cheap and very effective. Spray in quick, short burst at various angles on the fans to de-dust them. If you have dust filters, remove and clean those too. Optional: Vacuum around the area (carpet) afterwards - but don't use a vacuum inside the case (depending on type, quite a few can cause static damage).
Ensure inside the PC case, cables / wires aren't cluttered. Move them around the edges or behind the motherboard if possible. This allows for more cool airflow across the board.
Move the PC case away from walls/corners if possible. At least have a 1 1/2 to 2 foot minimum gap at the back to allow exhausted hot air room to escape.
Don't have the PC on carpet either. Raise it up from ground level, if possible. A glass or wooden panel will do the trick, if it's not on the desk.
How many fans does your system have and their positions?
3 fans inside.
in the CPU fan there is a layer of dust behind it, does that block it?
Depending how thick the dust, it can cause more heat / less cooling effectively. Can of compressed air helps with that, it gets inbetween, without touching, balls up dust bunnies and they leap out by the pressure force. Might be worth doing. Remember just short, quick bursts (varies angles). It won't leave any residue and prevents over spinning the fan.