Possible Broken/braking GPU Need help

[Panic_Ice]

So i got a MSI Nvidia GTX 770 and and i got it a few months ago with my new rig. had very few problems until now. i have been monitoring my gpu with msi afterburner and i tried overclocking for the first time to help my fps on gta v cus for some reason my fps went from 60 fps avg to less then 30 with out me changing anything. i started to pay closer attention to afterburner to see if anything if changing like temp or w/e would cause this. but other then temp, no matter what changes i make the mhz (535mhz on gpu and 810 mhz on memory) stand and a constant standstill. i ran a few bench marks using furmark and msi kombuster 3. nothing changes no matter what i do. even when i change the voltage.

 

right now its running with these setting and stats on msi afterburner

-Cor voltage (mV) - +2  - staying at 0mv

Power limit at 100%

temp limit at 80 degrees C- currently and 32c

Core clock (Mhz) +250 - still at 535 mhz

Mem clock at +0 still at 810 mhz

fan speed is auto

 

any help would be great and if you need more info ask ill be watching this page all night

 

cpu 4th gen I7 3.2ghz

gpu msi gtx 770 2gb

ram 16 gb

power supply 850w