my PC reboot everytime I run any demanding game on it

[Rick_Baron]

Please help with this my PC reboot everytime I run any demanding game on it:

I can play these games for a while at 60+ fps but after some time my PC just shuts down without a warning and restarts immediately,
I don't know why is this happening my hardware is strong enough to run these games:

CPU: Intel core I7-4790k 4.0Ghz 4 cores
GPU: Nvidia geforce Gtx 750 ti Asus oc 2gb edition
Motherboard: Asus z97-a
Ram: adata 1333 4gb
Psu: acteck blazar af-b600w

Happens with this games:

Ark survival evolved (any configuration)
The Elder Scrolls V: Skyrim (high and ultra with or without mods)
Minecraft (with shaders mod)
Star Conflict (any configuration)
Battlefield 3 (ultra)

My question is: is this for Psu malfunction or the Psu don't support some component?

MORE INFO:
It's happening since I started to use this PC (was before my dad's PC, it had an Asus f1a75-v pro motherboard and an amd apu a4 3300 cpu and no gpu, and before it didn't shut down), the first time I used this PC I installed the actual gpu and played some games without a problem but then it happened first I thought it was because of CPU overheating so I decided to buy the actual CPU and motherboard but after install the new components it still shuts down.

Hope you can help me with this

 

[chimera201]

Replace PSU with a good one.

 

[R4DIO4CT1VE]

Yeah PSU would probably be the thing to replace. Obviously keeping an eye on your heat is never a bad thing as well in the future since that can cause similar issues.

 

[Rick_Baron]

I discovered that the Psu fan is not working I will replace to see if is that.

Thanks anyway