Computer shuts off with Crysis 2 only - i5-4690k 7970 xfire

[ghostdog662]

Just put together a new system.

Running an i5-4690k oc to 4ghz (not much) with Corsair H60 watercooler.
Two Radeon 7970 , Gigabyte OC'd 1000mhz version.
MSI Krait Z97 motherboard
Corsair CX750m power supply
Windows 8.1

Every game runs great. Far cry 4, gta5, witcher3 etc.

But for some reason when I play crysis 2 WITH CROSSFIRE ON after about 20 minutes or so my computer will shut down completely. It does not power back on immediately with the power button. If I unplug the power cord and wait about 10 seconds it will turn on like nothing happened.

If I run it with CROSSFIRE OFFI managed to play a solid hour (with lower fps of course) and no problems.

I have run a temperature monitor on my cpu on my other monitor while gaming and it doesn't go above 62c.

I just wanted you opinions but from what it seems is my power supply is not keeping up.

 

[Archaic59]

You may be correct about your PSU. Not only is the quality of the CX well below acceptable levels, you are a bit underpowered. A good quality 800-850 would do well in your system. Here's a good quality EVGA unit made by Super Flower that won't break your bank-

EVGA 850 B2 80+ Bronze Certified Semi-Modular ATX Power Supply

PCPartPicker part list / Price breakdown by merchant

Power Supply: EVGA 850W 80+ Bronze Certified Semi-Modular ATX Power Supply ($69.99 @ NCIX US)
Total: $89.99
Total: $69.99 after rebate
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-07-22 22:02 EDT-0400

 

[Silverbear]

Your power supply is too weak and of lackluster quality. 7970s in crossfire require a quality 800 Watt PSU:

http://www.realhardtechx.com/index_archivos/Page362.htm

EDIT: I see Archaic beat me by mere seconds, lol.

If you want something fully modular:

EVGA G2:
http://pcpartpicker.com/part/evga-power-supply-220g20850xr

 

[need4speeds]

Try dropping the clocks to something like 880mhz and try playing the game again. The wattage should drop by over 10%. That could be enough to stop the power supply from tripping off.

In a extreme example of this. I fixed this discarded computer, a compaq with a AM2 X2-4100+ and Vista. Oem bestec power supply. I got a HD-4870 sapphire vapor-x working in it by dropping the clocks from the stock 750mhz gpu, 900mhz memory to 600mhz gpu, 700mhz memory. It passed furmark testing and games run fine on it. The computer is still working like that over a year later.

Make sure you blow the dust out of the power supply and video cards. Don't let the fans spin out of control use a plastic or wood stick to stop it from spinning. It could be just overheating.

This could work until you get another power supply and does help troubleshoot the issue. Try the lowest gpu and video card speed settings. If this stops it from tripping off, then you can keep increasing it until you find the speed it can run at. This could work until you get another power supply.