Drop in graphics performance

All welcome at the game(Beam'ng) I lost the game for what feels like regurgitated driver,video Card 580 Zotac Amp with temperature all is normal,no artifacts,not overclocked,mine it makes no sense,wood like this doesn't help, Productivity fell by about 50% while the video card works on the same frequency 815 mghz,in the same way with memory.The exact same situation was on the 760 graphics card point of view, but I thought that the bootleggers with a chip did something.The problem of serious play is not possible,lowering the frequency of the gpu is not reasonable.