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R7970 lightning crossfire issues

post #1 of 4
Thread Starter 
just curious if anyone is or was having issues with 7970's in crossfire?, i got two lightnings today and can run one no problem but when i enable crossfire i hard crash. i had two 590's on this same psu with no issues so i believe thats not it, i have CAT12.3 running and fresh windows install and cant get through anything with both cards enabled before it just crashes completely.
post #2 of 4
Try taking one out and testing each one induvidually, see if one of them is DOA.
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Money goes here.
(15 items)
 
  
CPUMotherboardGraphicsRAM
I7-2600k @ 5.0 GHz 1.3v Asus P8Z68-V PRO/Gen3 EVGA GTX 680 2GB SLI Underwater @ 1200MHZ G. Skill RipjawsX 16 4x4gb 
Hard DriveCoolingOSPower
Vertex 3 128g And two WD 2TB Greens TEC CPU block with 4 Black Ice GTX 480's Windows 7 Home Premium x64 Corsair AX1200 
Case
Caselabs T10 
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post #3 of 4
I am using crossfire Lightning 7970's for 5 days so far and i didnt experience a problem like that. It is also a fresh w7 installation with 12.3 drivers.

As jaykaybay suggested above; you should try them one by one. One of them might have a faulty.
post #4 of 4
Thread Starter 
yea i went ahead and tried them one by one and one appears to be bad, slightest stress you put on it and it crashes the entire system. the other card seems to be fine and runs at 1200/1600 with no issues. tried to reflash the bad card with the bios from the good card because i have had cards that came with a currupt bios before but winflash says already on the card and doesnt continue to flash.... oh well guess im sending it back. i didnt try the cards one by one at first because i read about alot of crossfire issues early on and was figuring i was missing something.
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