Computer crashing while under load

[Skillboom2]

Hi guys, 

I have a pretty high-end workstation that I bought at a charity auction put on by a large company to get rid of their unneeded computers.  Because of this unique situation, when I got the computer it had been wiped and needed a new OS and everything.  After a few months of it doing great in high settings gaming, it started crashing while in GTA or Total War or even starbound.  Sometimes the application would crash while other times the computer would hard crash.  The screens would all freeze with audio continuing.  It would require a full restart to get it going again.  Nothing was overheating, as shown below in the pic I took while the computer was frozen.  Any help would be much appreciated. 

Specs:

Intel Core i7-5960X

32 gb Ram

NVIDIA GTX Titan Z

500 gb ssd

4 Tb hard disk

[Streetguru]

25 minutes ago, Skillboom2 said:

 

Probably blame the power supply

 

drop your GPU's power target by 50% to take some load off and see if it still crashes.

[Skillboom2]

I've got a 1500 watt 80 plus gold pwr supply, but I will try lowering the power target

 

Edit: still crashes

 

I found some system warnings, don't know if they are related.