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CrossFire X Compatibility

Hello,

Earlier i bought a computer with 2 same Gigabyte HD4850 VGA cards (GV-R485-512H-B). Everything worked very well (in CrossFire too), till on one of these cards gone wrong the cooling system. It had warranty, so i took it back to the shop, but they had not any more piece of this card. They offered an other Gigabyte HD4850 (GV-R485MC-1GH) and they said this 2 cards are almost same, so i can use them in CrossFire. I accepted it. At home i installed the newest driver and Catalyst Control Center (v8.11). I turned on the CrossFire X and then came the first new thing. The Catalyst sent a message: because the 2 card isnt same, the system need a reboot. I did it. At the first 2 times my computer got ''Blue Screen of Death''. (I never got it earlier on this machine). Only at the 3rd time it could shut down normally and after that finally the CF was on. But it isnt working correctly. I got a lot of times the ''VPU Recovery'' problem message. I tried to reinstall the driver some times, but it could not help. (If i take only 1 of this cards into the computer, it always working well. I have problem only if they are together in CF.) So I would like to know, can i use somehow these 2 VGA cards together in CF or too much the differents between them and better if i go back to the shop and ask anyway 2 same cards? P.S.: Sorry if i wrote strange things, my english isnt so good.

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Oh ok, i see. Its new for me. I didnt try to use them without the bridge yet, so i dont know how is it working without it and with a DVI cable. Is it dangerous if i try to do that? Im not sure these 2 cards CF "Ready" or "Edition" type. It supports the CrossFireX. I found only that on the box about it. The both of cards have 2 DVI-I and 1 S-Video connectors. What is your opinion, should i try that (I mean the connecting with a DVI cable)?

Posted on Nov 28, 2008

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Hello,

Thank you very much for your answer. I never heard about this CF Edition or Ready things. Of course i checked the box of the card, but i didnt find anything about it. I think you use nVidia. The SLI bridge working only with this type of VGA cards (maybe there are in the SLI the Ready and Edition type). The ATi's use CrossFire bridge. The working of these 2 cards (nVidia and ATi) is very different. And i got yesterday an answer from the Gigabyte too. They said, if i want to use the CrossFire well i need anyway 2 perfectly same cards, so i will go back to the shop :)

Have a good a day!

Posted on Nov 28, 2008

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Hello,

Are your cards both "Crossfire Ready" cards?, or are they both "Crossfire Edition" cards? Check the boxes if you still have them. Its important because the type of cards you use will determine how you connect them to enable Crossfire. If both cards are "Crossfire Ready" cards, you will need an SLI bridge and then connect your monitor to the bottom card.

Normally, (if your not using the bridge) crossfire is enabled using one "Crossfire Edition" co-processor card and the other card being a "Crossfire Ready" card. Then you connect the to cards together with the adapter.

Let me know and we can continue. Best of luck

Posted on Nov 26, 2008

  • MW1961 Nov 28, 2008

    That is correct and is what I was trying to say. You can use both Crossfire ready cards, but without the co-prossessing "Crossfire Edition" card you will have to bridge the two cards. ATI makes two versions of the crossfire card. One is a co-prossessing card "edition" and the other is a crossfirefire "Ready" card. they are meant to work in unison without bridging them. With the bridge you will connect a single DVI connector to the bottom card.



    Good luck!

  • MW1961 Nov 29, 2008

    No your not going to hurt anything. If you have the dual DVI connector, connect both cards via that connector then to your monitor. open Catalyst and check that crossfire is enabled. If its not working, and you have the bridge, bridge the two cards and connect one DVI to the bottom card. Again check if crossfire is enabled. let me know.

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