Machine powering off can only be two things, heat or PSU related.

650W should be enough for that system. Though it is not always just about the max Watts with PSUs.

Bad RAM can certainly cause BSOD, not sure about a hard shutdown.

Ashes is great at pushing hardware hard to get the best out of it, but it does mean some overclocked systems which are fine in other games can crash too, though again, not sure about a hard shutdown.

So if you have overclocks you could try without and if you are getting new RAM anyway you'll know then too. Not sure about testing PSUs, a google search might be in order.

If it's an older power supply (i.e. made before the GTX 900 series was released) it may not be able to correctly handle that card. Not for the obvious reason of insufficient power, but because the power demand of those cards can be very spiky, and those spikes may trigger the overvoltage protection on such older PSUs (the sudden unexpected demand spike is treated as a short, basically).

I had the same issue sporadically in various games, since I'd originally built my rig a year or two before the GTX 970 came out. Unfortunately there is not always a direct correlation between your graphics settings and the card's power demand, so you can't guarantee being able to mitigate it just by lowering settings. If that's your issue, there isn't really anything for it but to buy a newer PSU which is designed with the card's behavior in mind.

Quoting DKTrue,

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Quoting DKTrue,

reply 2

I guess your name is key to my problem.  

I have a 650 Watt Power Supply which currently supports:
...
Is there a way how I can test if my PSU is putting through enough juice?

You can use a multimeter, or use something like HWmonitor (http://www.cpuid.com/softwares/hwmonitor.html) to see what they are reporting.

What brand 650W PSU is this?

 

Will check the brand when I get home from work, but the PSU is basically OLD. It would have been the next thing to change with the RAM. Is there any specific thing from HWMonitor you want to know or should I just try to monitor via the internal application feature for as long as possible before it dies?

Basically, what are the +12v, +5v, and +3.3v reporting when you stress the system?

There is pretty much 0 chance of RAM being the culprit for machine power down, so, I would ask that IT department if they have any spare PSUs you can borrow to test them out.

Sounds like Power Supply..  Do you happen to have a larger PS?  Another thing could be over clock regardless of temp. Ive seen alot of reports, blurbs from Devs, Ashes does not like overclocking. As a tech, Id try the reinstalls, drivers etc, then hardware. First PSU, then memory, cpu, MB, HDs, CD drives.  Is ashes the only thing that ever crashes?

 I crash at the end of a game vs AI everytime. I kill last AI and I crash to desktop.  It is consistant. I am also losing save games it seems. I only get 3 autosaves, and I can save game manually once, then it seems it just wont save the game. I check the Dir and its not there.. strange

Glad you got it going.  I think I have a corsair in one of my desktops and no problems there, but its one PSU.. I generally go with the 80+ psu.. Anymore I buy 750 watt or higher.  Seperate 12, 5 and 24 rails.. You cant buy too big of a psu, unless you have a small case.. heh

Depends on hardware.  Run an AMD FX cpu, 2 AMD Video cards, a few drives and you may need close to 900 watts. I am running  an FX 8320, ATI R9 380 4gig, 16 gig ram, 3 HDs, 1 SSD, 1 Blueray burner, on an 750 watt 80+ cert PSU.