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Crossfire 5870's in BF3 Beta perform great, but...

post #1 of 3
Thread Starter 
...I can't get over this insane amount of microstutter and random gpu2 50% slow downs. I'm going to have to try this fix tonight to see if that helps.

I did some benchmarks this morning with my sigrig (both 5870's are 1GB models at stock 850MHz core clocks...one is a reference Diamond and the other is a Gigabyte with twin fans that I picked up yesterday). Each benchmark was done as a 5-minute Fraps test. Indoor numbers are while defending inside and outside numbers are while defending outside at the first point.

Obviously there are a lot of factors that make this test less than valid like getting higher fps while waiting to respawn, differences in interactions, my random gpu2 usage drops, and plenty of other things, but I figured I would post up my preliminary results anyway. Also, I'm using the 11.10 preview drivers.

Running 1920x1200, full max settings ("Ultra" preset, then change AA Post Processing to "High")

Outside average: 52fps
Inside average: 64fps

Running 1920x1200 with the standard "Ultra" preset (All Ultra with AA Post Processing on "Medium")

Outside average: 57fps
Inside average: 69fps

I am planning on doing some more testing after I do the xfire fix I posted above.
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post #2 of 3
Have you tried clocking down your first pci e slot to 8x? Does this happen in other games?
    
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post #3 of 3
Thread Starter 
Did the fix and it works much better. I turned the settings down to 2x MSAA and low AA post processing (but everything else Ultra/as high as it will go) and the thing almost never goes below 60fps with Vsync on, even outside. The only place it drops to about 45 fps or so is when running through super thick smoke.

Here is a screenshot with it on the full ultra preset.

attachment.php?attachmentid=232393&stc=1&d=1317942074
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