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I have two Gigabyte HD4850's on a P5Q pro. The manual says 2 bridges are necessary but some fora sayit isn't. Can anyone clear this out?

What's the benefit you get from two bridges over having only one?

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2 Answers

up vote 2 down vote accepted

Use two bridges assure more stability. But the real meaning of the second crossfire is to add a third card.

Also provides more stability in benchmarks (second link)

Refs:

http://www.tomshardware.com/forum/309640-33-crossfire-bridges

http://www.xtremesystems.org/forums/showthread.php?235626-1-crossfire-bridge-vs-2-crossfire-bridges

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Can you add a reference for this? Is there some official source that has this information? –  nhinkle Apr 8 '12 at 21:26
    
There, I can't add more references because of the limited reputation. –  Sein Oxygen Apr 8 '12 at 22:45
    
Thanks @SeinOxygen for adding more info! You'll get the ability to add more links soon. –  nhinkle Apr 8 '12 at 22:47
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  • Intel chipset + HD 4850s + 1 crossfire bridge = yes to crossfire (some of the earlier HD xxxx require 2).

  • Nvidia chipset = crossfire not possible.

  • AMD chipset = crossfireX (no bridge needed depends on chipset & GPU) or crossfire with a bridge is a yes.

  • 890gx,890fx, 990x or 990fx = crossfire faster and the 990s will SLI too.

Last but not least, there is asymetrical crossfire with an AMD APU (Llano) and specific GPUs.

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