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Power failure when Crossfire enabled

Tags:
  • Crash
  • Intel
  • Power
  • Crossfire
  • Corsair
  • Graphics
  • Radeon
Last response: in Graphics & Displays
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October 2, 2013 7:44:21 PM

I built a new system ~3 weeks ago. I've been struggling with system crashes since then. The system runs fine if Crossfire is disabled, but when I turn Crossfire on I get a hard crash after 3-5 minutes. The power dies, the computer shuts off, and I have to hold power for 5 seconds to get it to boot back up. Windows event viewer shows an Event ID 41, Kernel-Power, but does not provide any further details. My temps are fine, in the 70-80 C range on the GPUs, and 40s for the CPU (water cooled). I'm currently using the AMD 13.10 beta2 drivers, but have tried 13.1 and 13.8 as well with no luck. Side note, I'm able to run litecoin mining for hours on end with no crashes (w/ Crossfire disabled).

Any ideas on what may be the problem? I've updated the motherboard bios. I have both crossfire cables attached (but have also tried with only 1). I've swapped out PSU PCIe modular cables. I've tried multiple AMD drivers. I'm convinced I have bad component. Faulty GPUs? Faulty PSU? I'm at wits end, having tried many things, and am about to start RMA'ing parts starting with the PSU.

System specs (everything running at stock, currently):
Windows 8 x64
Intel i5-4670K
2x 4GB PC 1600 RAM
ASRock Z87 Extreme4
Sandisk 128GB SSD
2x Western Digital HDDs
2x reference MSI Radeon HD 7950s (crossfired)
1 DVDRW drive
5 case fans
1 water pump on the CPU
Corsair HX850 power supply

Thanks in advance!

More about : power failure crossfire enabled

October 3, 2013 5:36:49 AM

Thanks for the link about C-State. I had not heard about that. I tried disabling it and unfortunately it did not resolve the issue.

CAP profiles I've tried already.

Any other ideas would be very appreciated!
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October 6, 2013 10:05:36 PM

Follow-up: ran MemTest86 and found out I had some bad ram, which I exchanged. However, I'm still getting the system crashes.

Dr. Debug on my motherboard is giving me a 04 error while shutting down, and a A2/A6 error when I boot into BIOS. When I am booted into Windows, though, it shows no error codes.
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October 7, 2013 4:33:55 PM

Sorry about the crashes. A2/A4 is completely normal codes during boot. 04 is un-remarkable during shut down.

Oct 18th windows 8.1 official comes out (free upgrade) & hoping that removes it own head out of it's ass, as many bug fixes and new code = Better.
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October 7, 2013 8:39:00 PM

I got a watt meter to check the power consumption of the PSU. During the last crash, the system was only pulling 485W, which should be easily handled by my PSU. Since I'm failing to find any hardware issues, I am starting to think it may be software/drivers as you mentioned. In the meantime I'm talking to ASRock and MSI tech support to see if they have any suggestions.

Thanks for your help!
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