My PC randomly freezes when playing certain games

hi, i have recently built a new gaming PC but i have encountered a few problems whenever i play games such as Dayz, Minecraft or far cry 3 my computer freezes but for each game it freezes differently for example in Dayz my computer only freezes whenever i put the 3D resolution all the way up or just past half way also it freezes when i record with Fraps, and then there is Minecraft this game runs perfectly when Im not recording i get around 150 fps and it works fine but when i record i get around 60 to 80 fps and after about 2 to 5 minutes the PC will freeze and requires a full reboot, and finally there is far cry this game seems to operate the worst it freezes no matter what i do sometimes it does in the loading screens and then other times i can play about 5 to 20 minutes until it freezes.

I would really appreciate it if someone would suggest a solution to the problem.

my rig.

Asus X79 Sabertooth motherboard
TW 750 corsair PSU
Asus GTX 660 ti GPU
Corsair vengeance 32gb ddr3 1866mhz ram
H100 water CPU cooler
1Tb western digital caviar black hard drive
Intel Core i7 3820 Quad Core CPU
Corsair 650d case

tell me if I've forgotten something.
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  1. I'm not an expert but I'm 99% sure that It's your RAM.
    I have the same issue.
    If your RAM is not compatible with your motherboard you get freezes.
    Change your RAM voltage, timing ect to what I do not know.
    Last option update your bios. But It's the last option in my opinion.
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