PC Restarting When Gaming

[kakashi2015.ss]

SO i have This Asus GTX 760 that i have been using for 2 years now and when i play games on it,it crashes(BSOD Memory Management) but when its in my brother computer it runs just fine
But the problem is that when i put my brothers gpu in my pc it works just fine.So why does it not work with my PC.Please i need your help
SPECS
GTX 760 Asus
Motherboard H81M-K
1666 2x4 GB Ram


So i bought a new PSU 550 Watt Thermaltake and now there is a new problem..sometimes while playing games the game just freezes and i have to force shut down

 

[Greeko85]

Usually the memory management bsod indicates something else is amiss. Have you tried running other diagnostics such as memtest or even windows own memory testing tool? What are your temps like under load?

 

[kakashi2015.ss]

Usually the memory management bsod indicates something else is amiss. Have you tried running other diagnostics such as memtest or even windows own memory testing tool? What are your temps like under load?

Yes i have ran memtest and it dosent show an error and as i live in a very hot country our normal average temp is 35-40 so the gpu is always running hot at around 80C.But the temps have always been like that since the start