pc restarting and freezing when under heavy load

Jan 30, 2019
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mobo h81-s2pv
processor-core i3 4150
ram patriot viper 4gb x2
gpu- gigabyte gtx 970
psu- thermaltake smart se 630watt

i recently bought that gpu..when i'm playing hitman 2 or any high end graphics games it freezes or restarts
so i went to my friend's house to check my gpu if its a problem or not..
on his pc the gpu did so well
so i guess its not the gpu
can you guys tell me whats the problem?
 

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