FPS drop after cleaning out my PC

torres

Distinguished
Feb 2, 2010
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As the title states i was cleaning out my PC over the weekend and noticed a huge FPS drop in Shogun 2 and Rome 2. I just took out my GPU and re-installed it because it was in the way of one of fan ports on my mobo. I am getting constant 15-20fps on campaign map and battle map in both games at high settings where i used to get at lease 50fps in shogun and 40fps in rome. I also got some stuttering in Shadow of Mordor that never was there before. Far cry 4 seem to be running fine and I played it the whole day after the cleaning. I got 40fps on FC4. All my other games seems to be fine like FIFA 15 and Walking Dead
My Specs: 2500K @ stock
8G Ram
MSI GTX 660 OC
(Didnt OC it manually)
MSI H67 Motherboard And a normal 1tb HDD

What could this be? And why is it effecting the Total war Games this bad?