Crossfire question do I need the same brand of card?

EvilSponge

Senior member
Feb 23, 2003
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Hello all,

I was wondering if you had to use the same brand of video card to do crossfire.
My assumption as long as they are the same type you werr good to go

Thanks,
-sponge
 

deamer44

Guest
May 25, 2008
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you dont need the same brand too crossfire :) even differnt cards can crossfire (certian ones)
 

betasub

Platinum Member
Mar 22, 2006
2,677
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No, why would you think that?

Crossfire compatibility has nothing to do with brand, BIOS, clock speed, vRAM or anything like that. It simply requires that the drivers recognise that the GPUs are compatible - in OP's case, R700/RV770.
 

SkyDiver

Senior member
Aug 3, 2000
386
5
81
Hey All,
Maybe I can horn in on this thread. I have a Radeon 4850 waiting for me at home. It is replacing a X1950XTX. Then it hit me...I might be able to Crossfire these two. I have to research it yet, but does anyone have any thoughts on this? Would the old one slow down the 4850? I thought I read somewhere that they will both run at the slowest speed of the two. (That may have been old info.) I never seriously considered it before, so I'm not up to speed.

Thanks.
 

SkyDiver

Senior member
Aug 3, 2000
386
5
81
Yeah, like I said, I didn't even consider it until this guy who has a monster setup like yours, except he is running two GTX 280's, mentioned that it would work and would be faster than the 4850.
I was skeptical that it would be faster, but we were at work and I didn't have time to dig in....

BTW, SSChevy2001, I have a '67 Chevelle SS396, built to the 375HP spec with solid lifters, etc. Lots of fun to drive.
 

thilanliyan

Lifer
Jun 21, 2005
11,848
2,051
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I don't think you can crossfire the 4850 and x1950...I think they have to be the same generation. (ie. 4xxx series)
 

sgrinavi

Diamond Member
Jul 31, 2007
4,537
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I don't know if that particualr pair will crossfire, but you do get an improvement in performance (as opposed to averaging the two ) when you crossfire with a lesser card... Not a drastic improvement, but if it's free then why the hell not have some fun?
 

SkyDiver

Senior member
Aug 3, 2000
386
5
81
SSChevy2001: Very nice. What is under the hood of an '01 SS? If you want to see my Chevelle, I'd have to e-mail it. I'm not set up on any photo sharing site.
 

SkyDiver

Senior member
Aug 3, 2000
386
5
81
OK, I got the card installed (Asus EAH4850 Top) and when I look in the Catalyst Graphics Hardware, it says that my memory size is 1024MB. It clearly says on the box that I have 512MB. Any idea why it shows 1GB of "HyperMemory?"

Oh, by the way, it increased my 3DMark06 score by 138% to 11,986. I guess the CPU is my bottleneck now.