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Crossfire with 2 different cards?

J

jake661

n00b
Joined
Jul 25, 2006
Messages
29
I'm not too informed about crossfire, or SLI for that matter, but I was wondering if I get something along the lines of a x1900xt would it be possible to add an x1900xtx later for some crossfire goodness? Or perhaps even a newer generation card all together? Thanks for the help..
 
Unfortunately no. Crossfire only works with one ATI GPU, and a matching Crossfire Master card. So you would need a X1900XT, and the corresponding X1900XT mastercard to get it to work. Although you might be able to use a slower mastercard and have the slave card downclock itself to the slower cards speed, but I am not sure about that aspect.

SLI functions differently as you can use any two cards of the same series in SLI mode, despite the brand. So any two 7900GTs could be matched, or any two 7900GTX's.. etc etc.

Hope this helps.
 
You will have to add a X1900 Crossfire Edition card and you will get Crossfire. The Crossfire Edition, from what I have seen, only comes as a X1900XT.
 
wait one second here
you can mix and match sli cards????
would it be possible to say mix a 7800gt oc by bfg with say the xfx version????
basically can you mix and match 2 cards with different memory and clock speeds if they are the same card with sli?
 
toilet brush said:
wait one second here
you can mix and match sli cards????
would it be possible to say mix a 7800gt oc by bfg with say the xfx version????
basically can you mix and match 2 cards with different memory and clock speeds if they are the same card with sli?
Click to expand...


You can only Mix the Brands but it has to be 7800GTX with 7800GTX. Not 7800GTX and 6800GT. For the Clock speed it will clock down to the slowest speed of the two cards. As of now you can NOT mix different ram speeds. 256 with 256 = good. 512 with 512 = bad.
 
i assume it will also clock down the ram too but still thats amazing i was always under the impression you couldnt put 2 different componys cards together but thanks for clearing that out
 
ReDgUaRd008 said:
You can only Mix the Brands but it has to be 7800GTX with 7800GTX. Not 7800GTX and 6800GT. For the Clock speed it will clock down to the slowest speed of the two cards. As of now you can NOT mix different ram speeds. 256 with 256 = good. 512 with 512 = bad.
Click to expand...


I forget where, but I read that after some experimenting they found that the two cards use the clockspeed of whichever card is in the first slot.
 
i remember the big thing about crossfire was that you could use ANY PCI-E radeon with a crossfire mother card.
 
Addicted said:
I forget where, but I read that after some experimenting they found that the two cards use the clockspeed of whichever card is in the first slot.
Click to expand...


What your saying is right. The clocks are whatever is in the primary PCI-e slot. I have eVGA and XFX 512mb 7800GTX's that both have different stock clocks and whichever is in the secondary slot matches the primary.

So either stick the lower clocked card in the primary or make sure the lower clocked one can run ok at the higher ones settings.
 
I have the XFX and BFG 7800GT's in my system right now and shes been good. ZERO problems. The faster one just downclocks to the slower one then you can overclock from there.
 
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