Why does my PC freeze while gaming?

When I play high graphics games like csgo or DayZ my PC will run the game just fine but then it seems like when the GPU temp gets around 48 degrees it freezes or reboots .-. Please help
 
How old is the GPU? What is the make and model of this PC? You don't have to quote every post
 
You will need to carefully clean out the dust in the case, especially around the cooling fans for the CPU. I use a small artist's brush and hold a vacuum cleaner nozzle near by. Just need to be careful.
 
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