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Transition to CrossFireX

post #1 of 31
Thread Starter 
I have read a lot but learned little frown.gif

Just found this:

also : this is VERY important. DO NOT EVER USE MORE THAN 1 CROSSFIRE BRIDGE PER 2 CARDS. Ie you have 2 cards so you have to have 2-1 crossfire bridges. Using both will cause you to have to format a million times and never have your cards working correctly either. So just make absolutely sure that you uninstall, clean and reinstall your drivers after changing this.


and also something about a similar problem to mine (Xfire refusing to work properly ever) being solved by using the Xfire bridge supplied with the CH4F instead of the one supplied with the card... is there any merit to this?

Mainly, what's the safest way (most likely to succeed without a hitch) to move from a stable single HD6870 to CrossFired HD6870s?

Thanks,
Sam


edit: also just read that changing the PCIE frequency in BIOS from 100 to 101 seems to have fixed a lot of people's similar issues; how does that work?
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post #2 of 31
Im kind of slow, so i guess i really dont know what your asking?
Just how to run crossfire?
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post #3 of 31
I had no issues moving from a single 6950 unlocked to dual unlocked 6950's. All I did was stick the 2nd card in, connect a single CrossfireX bridge, boot into Windows and uninstall drivers, reboot and install new drivers, enable CrossfireX in CCC. Worked just fine.

I would probably uninstall the drivers before installing the 2nd 6870. Might reduce the risk of driver issues.

No idea about the PCIe frequency bump.
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post #4 of 31
For me, i just installed the driver for my 5970, turned off my PC, slapped in my 5830 and crossfire bridge, turned on my PC, the auto detect went off, and CCC was like... DO YOU WANNA ENABLE CROSSFIRE X? and im like YEH!!!!! and i enabled it, and GPU-Z shows 3 way crossfire biggrin.gif
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post #5 of 31
Liten to pentium and the bucktoothed jigglypuff, its pretty much just plug in the crossfire cable and thats it
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post #6 of 31

 

Quote:
 Originally Posted by savage1987 View Post

I have read a lot but learned little frown.gif
Just found this:
also : this is VERY important. DO NOT EVER USE MORE THAN 1 CROSSFIRE BRIDGE PER 2 CARDS. Ie you have 2 cards so you have to have 2-1 crossfire bridges. Using both will cause you to have to format a million times and never have your cards working correctly either. So just make absolutely sure that you uninstall, clean and reinstall your drivers after changing this.
 

 

Partly correct but for the wrong reasons. Use only one bridge, two will not have benefits of performance but more likely to cause graphical glitches as a result of cross-talk.

 

Quote:
 Originally Posted by savage1987 View Post

and also something about a similar problem to mine (Xfire refusing to work properly ever) being solved by using the Xfire bridge supplied with the CH4F instead of the one supplied with the card... is there any merit to this?
Mainly, what's the safest way (most likely to succeed without a hitch) to move from a stable single HD6870 to CrossFired HD6870s?

 

Use the standard bridge supplied with the cards, no such other bridges available to increase performance. He made that statement without knowing that the bridge he used was defective (or other reasons) and replacing it with another bridge fixed it.

 

Also, just uninstall drivers, put the second card in PCIe slot, mount crossfire bridge, plug in PCIe power from PSU and install Catalyst + CAP (Crossfire Application Profile for crossfire scaling) in links below. Uninstall Catalyst is a good practice for a reason.

 

32-bit OS Drivers

64-bit OS Drivers


 

Quote:
Originally Posted by savage1987 View Post

edit: also just read that changing the PCIE frequency in BIOS from 100 to 101 seems to have fixed a lot of people's similar issues; how does that work?


That's mostly for benchmarkers with carzy high overclock to increase performance and stability for multi-gpu setup. This does not apply to all chipsets. Such as on X58 chipset, will see performance gain and stability by increasing the North Bridge voltage and PCIe frequency because PCIe is from North Bridge X58 chipset. For average PC gamers with 2-3 cards, this has no benefits at all. Without proper tweaking will cause more stability issues rather than performance.


Edited by Ken1649 - 2/2/12 at 3:26pm
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post #7 of 31
Thread Starter 
Thanks for the replies guys, I have had a lot of trouble with getting CrossFire stable on this system in the past so all input is appreciated.
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post #8 of 31
Thread Starter 
Somehow this system is working strongly with functional (I think it's functional anyway tongue.gif) CrossFire setup.

I don't know what did it - a few things changed - but I'm not complaining!!


Possible causes include:
  • stock clocks on the CPU again (for the moment)
  • used a new crossfire bridge (MSI supplied one instead of the CH4F one I had used in the past)
  • disassembled and reassembled almost the entire system




Soon the overclocking process can begin again!!


What's the easiest sure-fire way to tell if the 2nd card is doing its job? Only test I've done is Mass Effect 2 for a few hours but that's hardly a stress test and I'm not even sure it used the 2nd card. Easy test using Furmark and GPU-Z? I have those already.
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post #9 of 31
Easiest test would be to play a game, and have MSI afterburner up while playing. Make sure you have the graphic settings on the highest they can go(try playing the most graphic intense game you have), and turn v-sync off. Play for a little bit, then minimize the game and look at the afterburner graphs. Under GPU usage, they should both be anywhere from 80% to 99%.

Edit: You can use GPU-Z as well, same thing. Look at the gpu usage chart
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post #10 of 31
Thread Starter 
old
4GHz, 1 card
http://3dmark.com/3dm11/2664020



new
3.2GHz, 2 cards
http://3dmark.com/3dm11/2684446


I guess it's working smile.gif
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