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CrossFireX not working on 2x 4870 in Win7

Forum Graphic & Displays : ATI - CrossFireX not working on 2x 4870 in Win7

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Hi all,
So first my specs:
Mobo: GA-MA790GP-DS4H latest Bios (F5).
CPU: AMD Phenom 9950 Black Edition - stock freq.
GPU 1: ASUS EAH4870 DK/HTDI/512MD5
GPU 1: ASUS EAH4870 DK/HTDI/512MD5 (the same).
DDRAM2 6GB Corssair
OS: Windows 7 64bit
PSU 700W

Problem: I have purchased second 4870 yesterday and plugged it into my rig. Win7 recognised it and soon CrossFire worked. But when I started testing it in games it turned out that my case(4 year old) was having big problems dissipating the heat the two graphic cards were making so I bought a new case. Moved everything into the new case except the TV adapter I was not using anyway and booted up the PC. At first it didn't worked and after a few tries I decided to reset bios. Done and now the computer was booting into Win7. I must say I was too tired to make a fresh install so it's the same Windows.
The problem only appeared now as the second card is not showing up in device manager or CCC. I have the latest 9.9 drivers and CCC. Tried reinstalling the drivers after I uninstall and clean with driver sweeper but no luck.I put one card into main slot and tested it and then the other and they both work fine. I am at a loss as to what should I do next. So mainly second card is not appearing in windows device manager or CCC/GPU-z.

Add a reply

Do you have any options in the BIOS regarding enabling dual gpu's?

Is the power cabling all properly inserted?

It sounds like something not connected or enabled properly in the mobo.

------------------------------ I'm a git, deal with it.

Antec 1200,PC Power & Cooling 750,Gigabyte DS4-x48,Intel Q9550@3.4 W/Xigmatek S1283,8GB OCZ DDR2 800,ATI 4870X2,X-FI>CA 640C amp>Tannoy R300/Senn 595's
Reply to Strangestranger

I have no options about dual gpu. Only one to disable/enable onboard gpu. It worked with the onboard gpu enabled in my old case. Now it's not working with either option.

All cables are checked and functional.

Any other ideas?

Reply to b44ris

Does it not register at all in the CCC?

Are the options to enable crossfire shaded out?

Nope, not in CCC or Device manager. However the card is picked up by sisoft sandra.

From the pulldown menu of Advanced CCC the CrossfireX tab is hidden, not showing up at all.

Reply to b44ris

Well, all I can suggest is that yiu make sure any onboard chip is disabled any any drivers for it uninstalled, and that you download an older set of drivers and reinstall those, try it a couple of times but without using a driver sweeper and see if anything changes.

If it worked before and all you did was switch cases there is no reason for it not too work.

I will try older drivers when I get home. Will post here how it go.
Thanks for help

Reply to b44ris

Unfortunately older drivers are not working either. I think it must be related to BIOS since that's about the only thing that changed but I simply cannot imagine what exactly changed in there.

Reply to b44ris

This is an odd one, as it wouldn't work until you reset the bios and now that it is working the second gfx card does not show up.

If there is no option for enabling the second pci-e slot and it is powered and working then I see no reason for windows not to see it.

Does the fan spin up on the second card and does it settle down when in windows?

Also, assuming you have them connected in crossfire what happens when used as two seperate cards?

Can you get an output from the second card?

There is no option in bios to enable second pci-e slot.
The fan spins up on boot but I cannot really tell if its spinning down in windows.
I tried using just the second pci-e slot with just one vga in it but there is no output.
I think this is the problem. Second PCI-E seems dead except for the fact that it has power. Any ideas? Maybe a bios flash or ... I don't know.

Reply to b44ris

deleted

Message edited by redgarl on 09-26-2009 at 04:58:13 AM

Reply to redgarl

Fixed!

The card was not inserted fully into the slot but it was the case who was not permitting it to go any further.

It works now so thanks all for helping!

Reply to b44ris

Always the simple things, glad you got it fixed.

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CrossFireX not working on 2x 4870 in Win7

Forum Graphic & Displays : ATI - CrossFireX not working on 2x 4870 in Win7