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7850 Crossfire Problem, Second card not working

Last response: in Graphics & Displays
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Hello

I have been having problems with my sapphire 7850's oc, These cards are factory overclocked and perform very well. When I am doing anything graphically intensive for over 30 minutes my computer freezes, I cant move the mouse change any of the profiles on my keyboard, the computer just becomes unresponsive. It normally does it when I am playing Battlefield 3

I have looked at the temp of the CPU and GPU when it freezes the CPU is around 35-40c and both GPU's ranges from 25-35c.

I am currently use the computer with no crossfire bridge and it runs the games fine with no crashing, One thing that i noticed is that the second GPU's fan does not spin just before the crash, its not just that it does not spin it just turns off. I cant see the any details about the card in CCC or any other program that I use.

I am using the 12.6 drivers currently, I have tried reinstalling the drivers, and i even formatted my SSD then reinstalled windows 7.

Computer details:
CPU - Intel i7 3820
GPU - 2x sapphire 7850 oc
Motherboard - Asus Rampage Formula IV
Ram - 4x 4GB G.Skill 1600mh/z DDR3
SSD - Intel 60GB 330 series Sata 2.0
HDD - WD Green 1.5TB Sata 1.0
PSU - Thermaltake tough power 775w modular
CPU Cooler - Corsair h60
Case - Coolermaster HAF 912
DVD Rom - 24x Cd/Dvd burner
OS - Windows 7 Ultimate 64x

Please help I rely on my computer for everything School/work/gaming/CAD/Other

More about : 7850 crossfire problem card working

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Graphics card Expert

"I am currently use the computer with no crossfire bridge"

the bridge must be installed for crossfire to work.

the cards must be in PCIe slots 1 and 4. and power must be connected to both cards as well.
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Graphics card Expert

Uninstall the 12.6 drivers, use Driver Sweeper, install 12.7 beta drivers and make sure you install the 12.7 Catalyst Application Profiles. I had a similar problem with a 4850X2.
Graphics card Expert

Dr-Paperplanes said:
Guys I had the crossfire bridge on, just so that I can use it the crossfire bridge is off. Both card have power and I have swapped the cards around and the pcie slots around and still the same resault



we had to ask!
It may very well be a Mobo issue also.Any chance you know someone with a crossfire setup you can try your cards in?

another thing,have you plugged in the motherboard Molex power for the Pcie?

Earnie said:
we had to ask!
It may very well be a Mobo issue also.Any chance you know someone with a crossfire setup you can try your cards in?

another thing,have you plugged in the motherboard Molex power for the Pcie?


No, i haven't. When I built the computer I saw that molex plug on the motherboard and i didn't know what it was four, I will plug it in and see if the second card behaves it self.

I will report back with the results.

Thanks.

This is really gonna mess with my cable management because the molez plug is torward the middle of the board. :whistle: 
Graphics card Expert

Dr-Paperplanes said:
No, i haven't. When I built the computer I saw that molex plug on the motherboard and i didn't know what it was four, I will plug it in and see if the second card behaves it self.

I will report back with the results.

Thanks.

This is really gonna mess with my cable management because the molez plug is torward the middle of the board. :whistle: 


I know,buy its for extra power to the PCIe slots for multi-gpu setups,it may help.
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