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Crossfire

arc@css

arc@css

arc@css

Caporegime
Joined
8 Nov 2008
Posts
29,399
Hi all,

Thought I'd read somewhere that you can crossfire different spec cards. e.g. in my case a 4870X2 with a 512 4870 ?? Is this true?
If so, anything else worth knowing before attempting, drivers etc? If possible I'd have thought that it will only run as fast as the slower of the two cards.

Thank you.
 
Not with Xfire, the cards will run at their own independant speeds, not that it would matter to you anway though, as you would have 3x 4870's in Tri-fire. :p

You would lose the 2gb on the X2 though, as it will only use the memory on the card with the lowest amount, which would be 512mb in your case.

EDIT: Actually, im not sure if the X2's can be paired with single cards yet.
 
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Any more info on this....i am thinking of pairing my 4850 x512 with a 4870 x 1024...would it run ok or would i lose performance from the 4870

thx
 
It would run but you wouldnt lose perfrormance as you would have a 4870+4850 in Xfire, as with Xfire both cards can run at their own speeds (unlike SLi which have to be same speeds), however you would lose the 1024mb on the 4870, as the 4850 has 512mb which is the lowest amount, as when you pair 2x cards of differing memory sizes, you lose the memory on the card that has the most.:)
 
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LoadsaMoney said:
It would run but you wouldnt lose perfrormance as you would have a 4870+4850 in Xfire, as with Xfire both cards can run at their own speeds (unlike SLi which have to be same speeds), however you would lose the 1024mb on the 4870, as the 4850 has 512mb which is the lowest amount, as when you pair 2x cards of differing memory sizes, you lose the memory on the card that has the most.:)
Click to expand...

You would also lose the benefit given by the GDDR5 on the 4870 as you'd be limited by the far lower bandwidth GDDR3 on the 4850.

On the whole you'd be better off just selling the 4870 and getting a pair of 4850's.
 
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