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HD 4850 crossfire fan problem

Tags:
  • Graphics Cards
  • Fan
  • Crossfire
  • HD
  • Graphics
Last response: in Graphics & Displays
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July 28, 2010 7:42:08 AM

Hi there,

I recently purchased another HD 4850 but the fan on this card does not work when both the cards are on the motherboard (regardless of whether the Crossfire bridge is on or not). Both cards work fine when there is only one on the board, and it is only on the one card (the same one) where the fan does not work when both are on the board. I've tried switching the slots that the cards are in, but the effect is the same.

Has anyone come across this problem before? Is it something I can fix through software/drivers or do I need a replacement card?

System specs:
Two XFX Radeon HD 4850
Asus P5Q pro motherboard
Q6600 at stock speed
4gb DDR2 800
650w coolermaster psu

Thanks

More about : 4850 crossfire fan problem

a c 189 U Graphics card
July 28, 2010 7:59:47 AM

Try each card individually? Works?
July 28, 2010 8:29:05 AM

You have to disable ulps, (Ultra Low Power State), it seems to help with alot of driver problems. Goto run, and run 'regedit', so change your registry, Go to"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Cl ass\{4D36E968-E325-11CE-BFC1-08002BE10318}
and change "EnableUlps" to 0 under the 0000 and 0001 or 0003 keys.

It worked for me...
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July 28, 2010 8:49:14 AM

wa1 said:
Try each card individually? Works?


I've tried both cards individually in both slots and the fan works on both cards when only one is on the board.

Scanlia said:
You have to disable ulps, (Ultra Low Power State), it seems to help with alot of driver problems. Goto run, and run 'regedit', so change your registry, Go to"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Cl ass\{4D36E968-E325-11CE-BFC1-08002BE10318}
and change "EnableUlps" to 0 under the 0000 and 0001 or 0003 keys.

It worked for me...


I checked the registry settings for 0000 and 0001 and it was already on 0.

Any other ideas?
July 28, 2010 2:02:51 PM

wa1 said:
Try each card individually? Works?


After some additional testing I have found that the card's fan also fails to work when on it's own. It seems that it only works sometimes when booting up, which is very strange. Just coincidence that on first run of testing it worked on it's own but not in crossfire.

Will be getting a replacement.
!