Crossover help with Z77

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ccombs2

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Sep 11, 2013
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I have two 7950's I want to run on a ASROCK Z77 Extreme 4. I currently have 32GB ram and an i7-3770k.
I can run either card in either PCI slot but when I try to cross them over I cannot install the drivers. It finds the driver but times out. Even if I provide the driver, same thing. HELP.

I have already flashed the BIOS as well
 
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ccombs2

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Sep 11, 2013
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I am using a bridge but you may be on to something with the PSU because after looking I'm boarderline. I have a 750 Watt PSU Bronze
 
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Ghengis-T

Ghengis-T

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Jan 13, 2012
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Your 750W PSU should be able to run those just fine, granted that it's providing enough Amps to your 12v rails.

Probably between 30-50A per rail, I assume? Should be plenty. Use this to calculate your power needs: http://www.extreme.outervision.com/psucalculatorlite.jsp

Also, CF drivers are a b****. When I ran 6870 CF, I had to use a custom driver package from Guru3D.com

 
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ccombs2

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Sep 11, 2013
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Thank you kind sir. I have built a couple of PC's in the past but always single GPU. I didn't upgrade the PSU when I bought the second card I checked the wattage but not amperage per rail. THANKS I'd bet anything that is my point of failure. However I do get power to the each card because the fans spin. Does that matter? Thanks again.
 
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Ghengis-T

Ghengis-T

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Jan 13, 2012
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If both cards are powering up, its probably OS or driver related. Newer motherboards accept CF & SLI with arms wide open. If you were lacking power, you would notice under load. Your PC will restart when it runs out of juice
 
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ccombs2

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Sep 11, 2013
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I have flashed the BIOS over and over
Used every version of the drivers that I can find
Successfully ran each card individually in each PCI port

If I only have one connected the driver loads and everything is kosher
When I connect the second card before uninstalling the first I can still run the single card and the second card's fan spins. Windows detects the second card but fails installing the driver.

If I uninstall the original card and try to install them both neither works. It times out loading the driver. Again either card works individually in either slot.

ASROCK has offered an RMA but I'm not 100% it is the Motherboard.

I switched PSU's just for a change up. The new one is only a 650w but it behaves exactly the same as the other. I don't see a noticeable power failure and the OS holds.

Thanks to all of your for being so helpful
 
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Ghengis-T

Ghengis-T

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I'm leaning on drivers at this point. My CF experience was epic-fail, so if both those 7950s still work, sell them and go Nvidia. Did I tell you that I'm a former AMD fanboy?

Anyway of trying the cards on a different PC? If you've got the time, make an image of your hard drive, then perform a clean install and start from scratch. If it still doesn't work, we can rule out the OS.
 
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