AMD XFX 280x Dual Crossfire - Second Cards seems to be running on low bandwidths

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Leonard Callus

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May 23, 2014
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Hi peeps. Recently I've been asking you with regards to how 280x crossfire works and if it runs on my current hardware - an Asus P6t SE and 1000w Power Supply. Everything seems to work fine but when I tried to test the difference between using one card and the other I'm not seeing that much improvement.

I've tested in fact 3 games. There was no observable difference between Crossfire Disable and Enabled with Crysis 3 and Murdered Soul Suspect (about 60 fps for the former and 30 for the latter - according to Fraps and values barely changed). Testing with Rome Total War 2 actually got worse with Crossfire Enabled for some reason or the other.

I've then tested with GPU-Z on one screen and running 3dMark11 Extreme on the other. I got a score of about X5800 which as I saw was pretty low compared to other 280x Crossfired. Also on the GPU-Z, it showed that 2nd GPU was getting very low bandwidth and bus speeds compared to the first and also some reduction in memory and gpu speeds.

I can post pictures of these readings - is there a way how I can solve this issue?

Additional info - Monitor used has a resolution of 1680x1050 and and driver used is the 14.6 beta version. Thank you!!
 
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Sounds like your second GPU is putting itself in power saver mode. This would be ideal behavior for the desktop or games that don't support crossfire (I'm pretty sure at least Crysis does, though). It could be the power connectors not being properly seated. It could be an improperly connected crossfire bridge. It could be that the cards are not configured to run crossfire properly (resulting in only one card running). Or, it could be some weird issue, that may be resolved with a driver rollback.

The hardware itself should all be compatible, in any case.

That said, with a 1680x1050 screen, there's a really good chance the refresh rate is only 60Hz, and frankly, you probably aren't going to get much out of crossfire with those cards and...
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Leonard Callus

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May 23, 2014
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Nope - I have attached it to the 16x as well so they should be running on a 16x 16x mode.
 
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Omegaclawe

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Sep 28, 2013
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Sounds like your second GPU is putting itself in power saver mode. This would be ideal behavior for the desktop or games that don't support crossfire (I'm pretty sure at least Crysis does, though). It could be the power connectors not being properly seated. It could be an improperly connected crossfire bridge. It could be that the cards are not configured to run crossfire properly (resulting in only one card running). Or, it could be some weird issue, that may be resolved with a driver rollback.

The hardware itself should all be compatible, in any case.

That said, with a 1680x1050 screen, there's a really good chance the refresh rate is only 60Hz, and frankly, you probably aren't going to get much out of crossfire with those cards and that screen. A 1080p monitor would probably have gotten you a much better visual upgrade for a lower cost. Crossfire/SLI is finicky and can't be guaranteed to work, especially with the (considerably) depreciated returns for double the cost (or more, what with stronger PSU's and better motherboards).
 
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