Alienware Aurora r4 randomly freezes

Hi,

I started to experience this random freezes for a while and so I decided to find a solution. It happens in two situation: When I turn on the computer for the first time in the morning and when I play a heavier game. The effects of the crash are the same:

-Both monitors freezes on the image they were displaying.

-Speaker make a very loud static sound.

-After a little one of the two screens becomes black.

-Fans and everything else stays at the same speed.

The only way to resolve this is to hard-reset the computer. I've also downloaded CPUID to keep monitoring temperatures before the crashes happens and they stay at normal levels all the time. 

My configuration is the following:

i7 4820k @ 4.20ghz (oc, happened also without the overclocking) --- 2-way SLI  GeForce GTX 760 --- Kingston HyperX Fury 16GB (4X4) 1866mhz --- Alienware Stock PSU 875w --- Samsung SSD 840 EVO --- Seagate Barracuda ST1000DM003-1CH162 1TB --- 1 HP Pavillion 23xi Monitor and 1 HP ZR2240w Monitor --- Razer BlackWidow Chroma keyboard --- Razer DeathAdder Chroma mouse