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Quote:
 Originally Posted by
savage1987 
I have read a lot but learned little

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.
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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.
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Quote:
 Originally Posted by
savage1987 
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?
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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.
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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.
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32-bit OS Drivers
64-bit OS Drivers
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Quote:
Originally Posted by
savage1987Â

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