How to enable crossfire?

newls1

newls1

Supreme [H]ardness
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Sep 8, 2003
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GUys, having the most horrible time with my 3870's..... I just did a fresh format, installed 7.11 driver with 1 3870 installed. Shut down the PC, installed the 2nd 3870, windows loaded, found the driver, I reboot, and thought maybe something would pop up saying "click here to enable crossfire", like nvidia does with SLi, but nothing popped up. I went into CCC, now I see a crossfire tab, clicked the check mark box to use crossfire, nothing flashed, moved, NOTHING. I existed CCC went back in, and the check was still in the crossfire box, so I thought crossfire would be working. Went into GPUz (newest version) it says crossfire enabled, but using only 1 GPU
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WTH is going on here. I decided to load up 3dmark06, and got a score of 13028
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That is 1000 points lower then my single 8800GTS 640 card. Clearly something is wrong here, I am using the 2 crossfire bridges attached to both cards, this is a fresh install of windoz, etc..... What can I do to make myself feel better about this issue? I cant believe 2 ATi 3870's get 13028 in 3dmark06, when all over the net I see people getting close to 18k with these? I must be doing something incorrectly. This is my first ATi purchase, so I need to learn how to use CCC, etc...... Maybe this is the problem. Thanks
 
stop using 3d mark. game with one card then enable cf and see if you notice any change.
 
go into overdrive, click the drop down arrow, if it allows you to overclock two cards separately, then cf is enabled in catalyst.
 
go into overdrive, click the drop down arrow, if it allows you to overclock two cards separately, then cf is enabled in catalyst
Click to expand...

Thanks for the info... I had crossfire enabled, but only one card oc'd Now Crysis runs much better. 2x 3850s @740 934 38 FPS with my custom config...:)
 
Here is a pic of my GPUz issue, as performance seems to be only using 1 card, it looks like GPUz is confirming that.

2002508106678026745_rs.jpg


See how GPUz says 1GPU, shouldn't it say 2 GPU's? I also uninstalled the 7.11 driver, and installed what driver that was on the DIAMOND CD which is 8.43 RC4, seems that I get slightly better performance, but just as much stuttering in games for some reason.
 
no when you're in crossfire the system sees your two cards as a single array, just like a raid.
i'm not surprised you're experiencing stuttering, but in most common cases, you should only see this problem in the most current games. if you've installed a clean os and are still having performance issues, you may have to consider that one or more of your cards needs to be returned. maybe you need to up date your mobo bios.
 
rennyf77 said:
no when you're in crossfire the system sees your two cards as a single array, just like a raid.
i'm not surprised you're experiencing stuttering, but in most common cases, you should only see this problem in the most current games. if you've installed a clean os and are still having performance issues, you may have to consider that one or more of your cards needs to be returned. maybe you need to up date your mobo bios.
Click to expand...
You are incorrect saying the systems sees 2 cards as 1. I just swapped motherboards, so im now using my Asus Maximus Formula, and not only am I getting PCIE 2.0 bandwidth and full 16x speeds for each card, but GPUz now shows 2 gpu's for crossfire, and here is a pic of my 3dmark06 score, and gpuz.


2001047168605712541_rs.jpg
 
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