Hello 
TL;DR : GPU drivers crashing on simple games , passed Furmark test but not Heaven Benchmark.
I have a problem with a PC that i purchased new 2 years ago.
Recently, Graphic card drivers started crashing while still loading games. Browsing the net & watching videos causes no problems.
It only crashes when trying to launch video games.
Things like Witcher 2 & minecraft. World of warcraft "a not so demanding game" would crash even if video settings were set to the lowest.
The error message is:
"display driver nvidia kernel mode driver stopped responding and has successfully recovered"
Card is out of Warranty & no one in my area got enough expertise to fix such problems.
*I Experience no Artefacts , white lines , black screens , blue screens or anything like that.
*Nothing was OC'd.
*No changes to software prior to the crash.
Things I tried so far:
-Monitoring Card's temps with HWMONITOR showed card crashing at 43c.
-Tested card for 15min with Furmark , no crashes , Temp stabilized at 83c.
-Attempting to test with Heaven benchmark crashes the program 5 seconds later.
-Tested CPU for 2 hours with Prime95 , no problems detected.
-Tested RAM with windows test, no problems.
-Tried different RAM sticks , GPU drivers still crash.
-Tried another PSU, didn't solve the problem.
-Tried different HDDs.
-Clean installed different windows systems to rule out driver's issues , same crash happened with windows7,8 & 10.
-Tried a different Graphic card & tested with Heaven Benchmark, crashes stopped.
What would cause a GPU to crash if not heat related problems? Should I attempt to open & clean the card? Reapply thermal paste? Bake the shit of my card ?
Right now , i am stuck with a 700$ paper weight. Any suggestions are welcome.
My build is:
PSU: Fractal Design Tesla 650W 80PLUS Gold R2
GPU: GIGABYTE GTX780 3 GB (384) of active 2xD H DP D5 OC
CPU: Intel Core i5-4570 BOX (3.2 GHz, LGA1150, VGA)
Case: Fractal Design Define R4 Black Pearl
RAM: 8 GB of DDR3-1600MHz Kingston HyperX Blu 2x4GB XMP kit
MOBO: ASUS B85M-G
HDD: Seagate 2TB HDD Desktop 64 MB SATAIII 7200rpm 2RZ
Thank you in advance , will rate best answer.

TL;DR : GPU drivers crashing on simple games , passed Furmark test but not Heaven Benchmark.
I have a problem with a PC that i purchased new 2 years ago.
Recently, Graphic card drivers started crashing while still loading games. Browsing the net & watching videos causes no problems.
It only crashes when trying to launch video games.
Things like Witcher 2 & minecraft. World of warcraft "a not so demanding game" would crash even if video settings were set to the lowest.
The error message is:
"display driver nvidia kernel mode driver stopped responding and has successfully recovered"
Card is out of Warranty & no one in my area got enough expertise to fix such problems.
*I Experience no Artefacts , white lines , black screens , blue screens or anything like that.
*Nothing was OC'd.
*No changes to software prior to the crash.
Things I tried so far:
-Monitoring Card's temps with HWMONITOR showed card crashing at 43c.
-Tested card for 15min with Furmark , no crashes , Temp stabilized at 83c.
-Attempting to test with Heaven benchmark crashes the program 5 seconds later.
-Tested CPU for 2 hours with Prime95 , no problems detected.
-Tested RAM with windows test, no problems.
-Tried different RAM sticks , GPU drivers still crash.
-Tried another PSU, didn't solve the problem.
-Tried different HDDs.
-Clean installed different windows systems to rule out driver's issues , same crash happened with windows7,8 & 10.
-Tried a different Graphic card & tested with Heaven Benchmark, crashes stopped.
What would cause a GPU to crash if not heat related problems? Should I attempt to open & clean the card? Reapply thermal paste? Bake the shit of my card ?
Right now , i am stuck with a 700$ paper weight. Any suggestions are welcome.
My build is:
PSU: Fractal Design Tesla 650W 80PLUS Gold R2
GPU: GIGABYTE GTX780 3 GB (384) of active 2xD H DP D5 OC
CPU: Intel Core i5-4570 BOX (3.2 GHz, LGA1150, VGA)
Case: Fractal Design Define R4 Black Pearl
RAM: 8 GB of DDR3-1600MHz Kingston HyperX Blu 2x4GB XMP kit
MOBO: ASUS B85M-G
HDD: Seagate 2TB HDD Desktop 64 MB SATAIII 7200rpm 2RZ
Thank you in advance , will rate best answer.