Can't enable crossfire with 7750s

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gerrymander61

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May 21, 2013
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Hey,

I recently picked up a second Radeon HD 7750 to crossfire with the one I currently have. I brought it home and installed it, but CCC won't let me enable crossfire, and, under the "information" tab, indicates that my second card is disabled.

The cards I own are both 7750s, one from Gigabyte and the other from ASUS, my motherboard is a P8P67 M PRO from ASUS, and I'm running Windows 8 64 bit. Oh, and my CCC version is 13.4.

If anyone could shed any light on this, it'd be greatly appreciated. Thanks!
 
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ingtar33

ingtar33

Glorious
Dec 17, 2012
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1) are both gpus showing up in control pannel>system>device manager?
2) if you go down to the xfire tab in ccc, can you click the box that says enable xfire?
3) if you go into your bios and check up on your gpu settings, is there an option to allow xfire/sli... something like pci-e mode <single> which can be changed to xfire/sli?
4) did you connect the xfire bridge?
 
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the great randini

the great randini

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Dec 23, 2011
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press the windows key + r at the same time
type devmgmt.msc
then press enter
expand display adapters, do you see a yellow exclamation point over one of them?

what power supply do you have, can you describe your build in detail?

for 7750 you do not need a crossfire bridge.
did you use the first two pcie slots closest to the cpu?
 
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gerrymander61

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May 21, 2013
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As far as I can tell, 7750s do not require a bridge

1) are both gpus showing up in control pannel>system>device manager?
2) if you go down to the xfire tab in ccc, can you click the box that says enable xfire?
3) if you go into your bios and check up on your gpu settings, is there an option to allow xfire/sli... something like pci-e mode <single> which can be changed to xfire/sli?
4) did you connect the xfire bridge?
Click to expand...

1) Yes
2) I do not seem to have a crossfire tab in CCC. Most guides I have looked at suggest that the crossfire option is found under "performance" but it isn't there for me.
3) I just checked both the BIOS and the mobo manual but I couldn't find anything that had to do with sli/crossfire

press the windows key + r at the same time
type devmgmt.msc
then press enter
expand display adapters, do you see a yellow exclamation point over one of them?

what power supply do you have, can you describe your build in detail?

for 7750 you do not need a crossfire bridge.
did you use the first two pcie slots closest to the cpu?
Click to expand...

No yellow exclamation over either of my display adapters in device manager, and I am using the first two pcie slots. I tried using slots 1 and 3 just to see if it would work but no dice.

System specs in detail:
OS: Windows 8 64 bit
CPU: i5-2300
Motherboard: ASUS P8P67 M PRO
PSU: Corsair TX850M (850 W)
Video Cards: AMD Radeon HD 7750 (one from Gigabyte, one ASUS. The ASUS one is the one that isn't working)
RAM: oh gosh I can't remember this exactly but it's 8Gb (2x4Gb) from Corsair

Anything else you want to know?
 
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corroded

corroded

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Sep 5, 2011
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Hmm... They do not even have the bridge connector...

Did you try uninstalling them both and then putting the ASUS in the primary slot, get it up and fully enabled, shut down, install the Gigabyte and make sure it can work independent of the ASUS, THEN enable CrossFire. Remember with Crossfire you have all the monitors plugged into the primary card......
 
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gerrymander61

Honorable
May 21, 2013
5
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10,510


Sorry for the slow reply, I was out and about all day yesterday.

I just tried this and both the ASUS and Gigabyte cards work fine by their own, but I can't enable Crossfire with either the ASUS in slot 1 nor with the Gigabyte in slot 1.
 
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ingtar33

ingtar33

Glorious
Dec 17, 2012
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yeah... i already looked at that myself before i posted the comment. without playing with the bios myself i'm not sure.

sorta confused on this one. i'd double check that both your 7750s are xfire compatible. some aren't (like the ddr3 version i think can't xfire), the onyl other option to give you is to contact ASUS yourself and see what they suggest. since it seems both gpus are working and the OS is detecting them i can only assume there is some mb/bios setting that needs to be set to make this work.
 
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