Alienware x51 r2 Crashes and automatic Reboots while gaming

Hi everyone,

I just got this desktop couple days ago,it reboots automatically when I play WOW.  (Specs: I7-4770, GTX 760, Win 7 Home Premium). 

Every time it just crashes all of sudden, no blue screen, no signs, it just restarts with a huge fan noise. It happens every time when I play however the onset time varies from couple mins to couple hours of game play. I have updated BIOS and all other drivers and cancelled PCIE-GEN3 in the Bios. 

Here is system crash info:

Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033

Additional information about the problem:
BCCode: 116
BCP1: FFFFFA800C9BF4E0
BCP2: FFFFF8800FE8F2BC
BCP3: FFFFFFFFC000009A
BCP4: 0000000000000004
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1

Thanks for your time!