Did some checking around, and it seems that there are others with the same problem here
Sounds like your graphics card is "normal" then, since others are having issues with the same model -- either a bug in the model or a conflict with the Geforce drivers -- or possibly a bad batch of some part that is used in manufacture of the cards.
You might want to try monitoring your graphics card temperatures while you play World of Tanks. Maybe the card tends to run hotter with World of Tanks than with other games.
You might check to make sure the fans on the card itself are turning.
There might be a driver version (possibly an older one) that works better with World of Tanks.
Or you could try reducing the resolution of the game and see if that helps.
One of the people who posted in the ***thread you found***
(B1acksh33p) said that helped.
But honestly, if it was me, I'd consider sending it back.
I'd be very frustrated to pay a lot for a graphics card and have it do this with games I wanted to play. And apparently Nvidia has little interest in fixing the problem (or isn't able to) because it's still happening. If the problem is due to a defective component, and not all cards are affected, they'll probably never fix it.
I'm sorry I wasn't aware of the problem with this model when you were asking about which card to get, and apparently no one else here was either.