My system shuts down

[DenyMX]

So I'm having a problem with my new system.During games,my pc freezes and the screen goes black.Then,it would seem like the system restarts,but the screen still remains black,like the monitor doesn't receive any data.I also have 2 coolers on my cpu working at 90-100%,and when the pc restarts,they stop.This makes me think that I have problems with my 680w psu ( I don't know the brand).Note that I have an Gigabyte AMD Radeon R9 270X OC WINDFORCE 3X,wich requires a psu with two 75w 6-pin PCI,and I'm not sure if my psu meets this requirement.
Can you guys give me some advices?Is this happening because of my cpu?If so,can someone recommend me a pretty cheap psu that would do the work?

My full system is this:
GPU: Gigabyte AMD Radeon R9 270X OC WINDFORCE 3X
CPU: AMD A10 6800B
Motherboard: Gigabyte F2A88XM-DS2
8gb RAM DDR3
PSU: 680w,but I don't know the brand.

 

[laviniuc]

if you used molex to pci ex power that's the problem... you need a better psu.