6970 performance drops after opening PC
Since I noticed BF4 started dropping FPS at times (on places that it hasn't drooped before) i opened the PC to inspect the graphic card if the fan had too much dust in it (i had similar problems in the past with graphic cards and this always resolved the issue), but since I put the card back on the performance drooped significantly. Now the games shutters all the time and is unplayable, I checked with other games as well. All the games that I played before on ultra (like black ops 2) has now become slow and very laggy. I tried formating but it doesnt help, i took the graphic card out and put it back in a few times still the same issue. Could i have damaged the graphic card somehow, since computer boots up and device manager says everything is ok.
Please help. Thanks in advance.