I have had this sortof problem constantly with my new cpu. Your cpu specs are nice by the way. 
My specs are as good as yours maybe better (i7) (2 nvidia gtx 260 sli)
Heres what you could do to fix your game crashes.
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Reinstall nvidia drivers
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Either Down clock your nvidia gpu with "Precision" software or downgrade the settings in game. Big monitors require more gpu power. Or both.
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Eliminate unnecessary background programs. (your CPU could probably handle it though)
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Better air flow inside case. (some cases make unnecessary ventilation to make it look cool.)
Your temperature for your graphics card should NOT exceed 100 degrees Fahrenheit.
What fixed it for me was downclocking both of my gpu and letting the game settings stay close to max.
Note: In Precision you can adjust your fan speed, set it to high if necessary.
Hope that helps! ;D 
[edit]
From the pictures i saw. You should get a new case. However, while it is likely the problem is at the gpu like mine, there's still a possibility that its not a heat failure or gpu failure. I do NOT want to be responsible for making you buy a new case. :-/
You could make a test and take everything out of the case and connect them on the table and run your pc. Spread your items apart on a non metalic table. This way heat rises away from your components. If possible blow a big fan on your chips (not super directly though)
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