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Crossfire won't work

Forum Graphic & Displays : Graphics Cards - Crossfire won't work

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jacks_85   06-12-2009 at 10:35:42 PM

hey guys this is really frusturating me!

so i have a amd phenom ii x4 955 on a asus m4a78t-e mother board. i am trying to get my radeon 4850 cards to crossfire and my second card won't detect in windows vista...

i know the two card work b/c i swap them with each other...but i am not sure if the second pci slot works?

can somebody give me some insight on this?

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AMG   06-12-2009 at 11:19:16 PM
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try to test your slots. stick one of your cards in and try it out if it don't boot or anything than after looking at the BIOS I would RMA the board


I dealt that board will have a jumper of any sort to get the second one working.

------------------------------ Q9550 3.8Ghz//ramapge formular//OCZ reaper 4Gb// 3 seagate HDDs// sapphire HD4870 512 // CM HAF 932
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jennyh   06-13-2009 at 12:25:50 AM
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Do you have your crossfire bridges connected? And if so, have you tried connecting both?

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jacks_85   06-13-2009 at 02:27:57 AM
- 0 +

I have one bridge and is on

How can I check in the bios

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jennyh   06-13-2009 at 02:48:12 AM
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You might need 2 bridges, that's what i'm trying to say.

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jacks_85   06-13-2009 at 04:11:44 AM
- 0 +

but i have looked on the web and it says i don't need two bridges...

and the problem is that vista don't even detect my second card on device manager...


is there a way to check if my second pci card in the bios detect my video card?

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Bronze Graphics badge mousemonkey   06-13-2009 at 04:16:13 AM
- 0 +

Have you tried GPU-z?

------------------------------ [:mousemonkey:1] http://img29.imageshack.us/img29/5041/vr2009champ.jpg
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jacks_85   06-13-2009 at 04:19:53 AM
- 0 +

no i have not...what does it do?

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Bronze Graphics badge mousemonkey   06-13-2009 at 04:29:40 AM
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It's just an info tool, but it should tell whether your second card is being seen.
http://www.guru3d.com/imageview.php?image=14271
Link.

------------------------------ [:mousemonkey:1] http://img29.imageshack.us/img29/5041/vr2009champ.jpg
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jacks_85   06-13-2009 at 05:12:50 AM
- 0 +

ok that sounds good i'll look into it...

could it bee the power is not enough b/c i am using the two 4pin adapters on each card connecting to the PSU (crossfrie approve) and it has my fans attached to them...?

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jacks_85   06-13-2009 at 10:32:30 AM
- 0 +

ok problem resolved!

i had the wrong power plug on them...i am guessing it was not giving enough power

Reply to jacks_85
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