is it any particular game?
whats the make and model of your Power Supply?
It may be worth removing one of your two GPUs as random crashes are sometimes a sign of a failing Power Supply.
Taking one of the two out will allow the power supply to work less hard, if the system is stable swap the cards around and test again. this wil ensure its not one of your cards starting to fail.
Sorry it took a while. I was really busy. I had some time today and I puled 1 of the video cards out and it seems like the systems is running faster and no more crashes.
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