How to disable crossfire in HD 7990?

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Nuno Miguel Costa

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Dec 13, 2013
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Can anyone explain me how do I disable crossfire in the HD 7990? I am using 13.9 drivers, and in CCC there is no option to disable it. In the (Gaming / 3D Apllication settings / AMD CrossfireX) there is only an option to turn frame pacing on or off, but no 'disable crossfire' option. Also, in RadeonPro I can't seem to find an option to disable it too, and i'm kinda tired of not being able to play games like War Thunder because of that.
 
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Fire2251

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Mar 22, 2013
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AMD has finally released Catalyst 13.12 but I don't know if it will help you. Regard to crossfire, I thought it is for linking 2 separate video card. My son has crossfire two 7850 and CCC has an option to turn on/off crossfire. 7990 is one card but has 2 video chip. Hopefully someone here will be able to answer how to turn off one of the video chip.
 
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inzone

inzone

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Mar 12, 2011
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Your saying that you can't play certain games because Crossfire is enabled ? What happens when you try to play these games ?

The crossfire option is enabled internally on the PCB. The card has internal solutions for needed graphics power so if it's not being used the second GPU will power down.
 
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Nuno Miguel Costa

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I "can" play them, but they are full of flckering, which makes the game unplayable.

example: https://www.youtube.com/watch?v=Drm5ZVU7ctI
 
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Nuno Miguel Costa

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Dec 13, 2013
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yeah the patch came out today. no more flickering on battlefield. but i still get flickering in games like War Thunder... if there was a way to turn crossfire off. it would be pretty cool, but apparently, for the 7990, there isnt...
 
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inzone

inzone

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Mar 12, 2011
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That's correct , because the Crossfire is done internally and there is a PLEX chip on the card what connects the two GPUs so the combined graphics power can be transmitted over a single Pci-e slot. The cards bios has a special functionality that allows the second GPU to power down when Idle

Maybe the solution is to down clock the 7990 and kind of limit it's power.
 
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