Nvidia GTX770m drops fps without reason

[predi]

Hi guys,second thread here before long time reading this forum for problems, really need help here becouse i dont undestand what is the problem.

I have a Alienware MX17r3 with a gtx770m upgraded, this was 2 years ago and i dont haved any problem (only the usually incompatibilitys, integrated intel graphics disabled and figthing to get sound working). Then i format my pc with the same windows ver. w7 x64 home premium (SP1) and after a few days, my GPU doesnt work properly. I having low fps and fps drops all the time.

I tried upgrading drivers to 355 (i haved 350 and it worked fine for me ever), clean reinstalls, formated another time and cloned with a image when it worked fine, checked temperature, dis/enable GPU, antivirus scan, bios default, checkd high perfomance in power options and nvidia panel, unistalling nvidia experience/hd sound, disabling windows transparecy and the only thing worked for 1/2 days was a system recuperation (that was after the format and cloning) with drivers reinstall.

Dunno what can i do now.

Sorry for my english.