So I am currently using a Radeon HD 7870. I've had this computer for 3 days, and the day I got it I played Minecraft at a max of 350 FPS. Days later though, I can't get anymore than 60. Is there something wrong with my graphics card? What may have caused this?
Also, I doubt this is the reason, but yesterday I underclocked (to try to fix something) the memory clock from 1200 mhz to 900 mhz, but I changed it back 10 minutes later.