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Can you put two different ATi cards in Crossfire?
- Thread starter geowal19
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Caporegime
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Only cards from the same series can be paired, i.e you can pair a 4870 with a 4850, and they would both run at their own speeds (4870 would not drop down to 4850 speeds), and they are linked together using internal bridges like Nvidia's SLi. 
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It depends on which 2 cards they are & they must be from the same series 3XXX or 4XXX.
They will run at their own independent speeds but the Vmem will match the size of the card with the smallest amount if the cards have different mounts of Vram.
The Vmem will also run at their independent speeds.
They will run at their own independent speeds but the Vmem will match the size of the card with the smallest amount if the cards have different mounts of Vram.
The Vmem will also run at their independent speeds.
Only cards from the same series can be paired, i.e you can pair a 4870 with a 4850, and they would both run at their own speeds (4870 would not drop down to 4850 speeds), and they are linked together using internal bridges like Nvidia's SLi.
What speed boost do you think you would get with 4870X2 with 4870 single with 1GB?
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Caporegime
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Should be a pretty good boost, as you would have 3x 4870's in Tri-fire, and 3x cards is supposedly the sweet spot.
Works in the same way (same internal bridges), only with Nvidia you have to pair the exact same cards, i.e 9800 GTX and 9800 GTX, and also they have to run at the same speeds, so if you have 2x cards with differing speeds, you have to always put the faster card into the Primary slot, as the slower card is automatically clocked up to match it, as if you put them the other way (slower card in Primary), then the faster card will downclock to match, unless Nvidia's done another update to it.
Works in the same way (same internal bridges), only with Nvidia you have to pair the exact same cards, i.e 9800 GTX and 9800 GTX, and also they have to run at the same speeds, so if you have 2x cards with differing speeds, you have to always put the faster card into the Primary slot, as the slower card is automatically clocked up to match it, as if you put them the other way (slower card in Primary), then the faster card will downclock to match, unless Nvidia's done another update to it.
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They also have something out called "hybrid sli" which you need a motherboard with onboard graphics, and either a 9800GTX or a 9800GX2 to use. It's more of a power saving thing than a performance thing though. Just thought that I'd mention it as I don't think that it's used much, I only found out about it the other day.
http://www.nvidia.com/object/hybrid_sli.html
That will force the 4870X2 down to 512mb but should still be interesting to see the trifire vs 4870x2 comparisons. My graphics card was delivered yesterday so I will be comparing the two when I get in my house tomorrow
When you say comparing the two, do you mean you have a 4870X2 with 4870 card in trifire mode?
Caporegime
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That will force the 4870X2 down to 512mb but should still be interesting to see the trifire vs 4870x2 comparisons. My graphics card was delivered yesterday so I will be comparing the two when I get in my house tomorrow
It wouldn't, he would still have 1gb as he said a 1gb 4870.
For any specific queries, please consult this link :
http://game.amd.com/us-en/content/images/crossfirex/CF_combo_chart.jpg
http://game.amd.com/us-en/content/images/crossfirex/CF_combo_chart.jpg
Thanks Fledge
It wouldn't, he would still have 1gb as he said a 1gb 4870.
Sorry that was aimed at arc@css not OP lol
I was going to compare the 4870X2 vs 4870X2+4870 512mb (= 4870X3 512mb)
I cant actually test my theory anyway since the Asus trifan is a beast.