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Crossfire disabling on contemporary GPUs

S

samuelmorris

Supreme [H]ardness
Joined
Dec 20, 2010
Messages
5,506
Apologies if this is a bit of a duplicate, but I couldn't find anything immediately obvious on this.

My HD6970s are getting a bit long in the tooth for gaming at 3840x2160, especially since I routinely have to disable crossfire for games to work leaving just one card trying to push such a high res. So, I wanted to know - what, if anything, has changed with regard to the way you enable/disable crossfire on contemporary cards like the 290X - of course, using 3840x2160, this will be in the context of Eyefinity.

As things stand, I can enable/disable crossfire fully with the HD6970s, but in order to do so I need to unplug the displayport cable from the graphics card end (monitor end doesn't do, sadly) and replug it or the monitor will stay in powersave.

Is this fixed with the more recent cards, and are there any other caveats I should be aware of? I seem to recall hearing the 'catalyst AI' trick for dual-GPU cards was removed recently, but I wasn't sure whether two physical cards were affected in any similar fashion :)
 
Your monitor staying sleep mode is not your cards fault. It's a known issue with your monitor.

Normal eyefinity setups don't have that issue with dual cards.
 
While I don't have the standing to dismiss that, I'm not really convinced. I honestly attributed it to the fact that HD6970s weren't officially supported at 4K (despite the fact that they clearly do work), since the cable had to be pulled at the graphics card end, whereas if it were the monitor, I wouldn't expect it to matter - further, it does not enter powersave unnecessarily at any other occasions (well, actually it now does after updating to 14.4 WHQL, but that's another story entirely!)
 
I don't need to pull any cables after enabling/disabling Crossfire with 2x 7970s @ 3840x2160. I would imagine the same goes for newer cards, like the 290/X.
 
Isn't the Seiki HDMI though? 30Hz displayport 1.1 and HDMI are flawless, it's only when 60Hz is involved it gets tricky :)
 
For 290X CF you can just enable/disable crossfire in AMD Catalyst Control Manager (CCC). No physical reconfiguration needed.
 
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