Possible Graphics Card Fault

i play world of warcraft and for months the pc was fine, no problems at all running the game at max settings, then about 3 or 4 weeks ago, i was playing WOW and the screen went black, i had to reboot the PC.
This happened on two or three occasions so i decided formatting the PC and putting on Windows 10, tried playing WOW this time and it worked for about 10 mins then the screen went black and i had to reboot again. Was playing another game i play Star Trek Online and was playing for about 25 mins or so this evening and it did the same thing, the computer went really quiet in comparison to its normal sound (ie fans whirring) there was also a burnt smell, so i rebooted and voila back it came, havent tried running any games since
 
the card is a Gigabyte GeForce GTX 970 WindForce OC 4096MB GDDR5 PCI-Express Graphics Card bought from overclockers in july 2015, i havent touched it other than install it in to the PC, and the CPU hasnt been touched in any way either, are you thinking it could be the CPU...? what would the smell be coming from then...?
 
No I was just asking about the overclocks as that is often at fault for random crashes and mishaps. If you ain't overclocked it isn't that, the smell is it there all the time? any idea where its coming from like Stu asked mate?
 
the smell isnt there all the time and as to where it is coming from i couldnt identify where and its bugging the hell out of me, as i dont know what it is that is causing the problem, initially thought it was perhaps a software problem hence me doing a format and install of windows 10, it wasnt
 
nope i havent left any plastic on the front of the card, if it was a problem with the gpu wouldnt it havent manifested itself prior to about 6 months of usage, and if there was a problem with the GPU why is it only when i was trying to run WOW which it had been running perfectly up till then, its most puzzling
 
tell me about it, i cant figure out what the cause might be, is it the motherboard..? i dont know, i did test the memory and the memory seems to be fine from the test i ran, i'm trying to be logical and think what it could possibly be, i thought 1) gpu, 2)cpu, 3)psu, 4)MB so its trying to eliminate which it could be to leave the what it is thats causing the fault
 
there are only three games i play regularly on this pc, world of warcraft, diablo 3 and star trek online, and they were all running fine until i encountered this problem, i havent tried diablo 3 since formatting the hard drive and putting on windows 10 as i dont want to have the same thing happen as it is with world of warcraft, and when it occured this evening i was playing star trek online and the sound of the fans on the pc went quieter than usual and i got the black screen i had before, not sure what fan went though, whether it was the psu fan, the cpu fan or one of the case fans
 
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