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[OCA] AMD Radeon R9 290X – CrossFire Bridge Not Required Anymore

post #1 of 112
Thread Starter 
Quote:
Since the release of the Radeon X1900 by ATi, AMD have been using the Crossfire Bridge to facilitate multi-GPU functionality. Prior to the introduction of the Radeon X1900 when AMD (ATi at that time before acquisition) had released their first PCI-E Radeon cards which used the PCI-E bus for communications rather than an external port or connector however a master card was required for full functionality of CrossFire which were expensive. NVIDIA at that time had already moved to SLI (Scalable Link Interface) that allowed to end bandwidth constraints of the PCI-e interface and send data between both graphics cards directly with the use of an external connector.



Source

I wonder what Nvidia will have to say to this? biggrin.gif Go AMD!
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post #2 of 112
I always disliked the crossfire/sli bridges from an aesthetics standpoint. This approach looks much cleaner. I wonder if there will be performance issues once pcie 3.0 bandwidth starts reaching its limits with newer cards.
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post #3 of 112
Hopefully this improves crossfire performance. Less latency even?
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post #4 of 112
Thread Starter 
Quote:
Originally Posted by rusky1 View Post

I always disliked the crossfire/sli bridges from an aesthetics standpoint. This approach looks much cleaner. I wonder if there will be performance issues once pcie 3.0 bandwidth starts reaching its limits with newer cards.

Did anyone else realize that there were no crossfire connectors on the cards when the photos first came out? rolleyes.gif

But yeah, I wonder if their would be a performance impact.
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post #5 of 112
I have 2x PCIE 3.0 slots. But I have a SB Intel CPU. So would this new CrossfireX work? or will they bring out a separate line of GPU's w/ the Crossfire Fingers?
post #6 of 112
Interesting. PCIE3.0 may have just become relevant for gamers.
post #7 of 112
crossifre via sideport.

5870 would have had it but they had to give it up to make a smaller die IIRC
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post #8 of 112
Quote:
Originally Posted by Atomfix View Post

Did anyone else realize that there were no crossfire connectors on the cards when the photos first came out? rolleyes.gif

But yeah, I wonder if their would be a performance impact.
Only everyone that saw the photo's, strangely I was the only one that said it had LED's and nobody believed me, a day later Linus said it had in his hands on.
Edited by maarten12100 - 9/29/13 at 11:51am
post #9 of 112
Quote:
Originally Posted by Atomfix View Post

Did anyone else realize that there were no crossfire connectors on the cards when the photos first came out? rolleyes.gif

But yeah, I wonder if their would be a performance impact.

Noticed it the day those XFX cards came out, another Overclocker than pointed out they discussed using PCI to do crossfire.

If this proves to be more efficient than SLI/crossfire bridges than call me sold. I'd love to see in the future a 90% to 100% increase in performance when throwing in a second card and not the usual randomness of 20-50% drool.gif
post #10 of 112
so is it only the new R9 line that won't need bridges or will it be a software update that will allow all GCN cards IE 7xxx series to stop using bridges?

Im guessing it will be R9 only since it says hardware dma block? Hope it wasn't a mistake buying a second 7950 for xfire a week ago lol.
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