Please Help!! over heating GPU!

So it started to happen yesterday, I was playing MGSV phantom pain, in extreme setting maxed out everything and suddenly the game like starts to freezes and the screen is having a seizure. The xbox controller light was blinking and the computer won't even listen to any command. So i had to force shut down by pressing power and i restarted, it does it repeats over and over again. I don't want to stress out my computer anymore. I believe my computer spec should be able to play maxed out setting. One thing I realized is that gpu that in connect to the screen gets extremely hot like 70c to 75c. other two are 30-40c range. so i tried defult setting too, same thing happens, so it is not really depending on what setting i play, i think it is heating in gpu, i checked internal everything, this computer is not even a month old.  Please help.

My PC is Alienware Area 51 R2

CPU: i7 5960x

GPU; Triple Titan X SLI Enabled 

RAM: 32gb

Please help!!