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Win 7 Crossfire NOT working

W

wolf2009

[H]ard|Gawd
Joined
Jan 23, 2008
Messages
1,767
Trying to get hd 4870 and hd 4890 to work in crossfire.

put 4870 in, windows picked up some drivers. put in 4890, it's not shown in device manager. Installed cat 9.8 hotfix, still no second card in device manger or GPU-Z.

tried the other way around too. one card is running on molex from 600 W PSU

update: did a bios reset, and it detected the second card. it's working now. thanks.
 
Last edited:
Check your jumpers. You probably need 2 jumpers as well.
 
When I ran my 4850 crossfire setup everyone told me i needed two bridges. I could not get the damn thing going with 2 bridges. I used 1 and it worked.

I dont know if that helps but gl mate.
 
no need 2 bridges peeps only 1, verify each card works , plug in power cords to card..
install 1 at a time then bridge.
 
ElMoIsEviL said:
no LOL

You would want a 750W PSU Minimum (smaller ones might work but not worth taking chances on).
Click to expand...

yeah, it sounds like the PSU is your problem. what brand "600 watt" PSU is it? if you don't know, then that's a bad sign. you need a nice power supply to run any multi GPU setup--that's always been the case.
 
update: did a bios reset, and it detected the second card. it's working now. thanks.
 
hehe! surprised to see no one mentioned it yet. 4890 has its own set of drivers which is different from 4800 series driver. you need to install driver for 4890. check amd's site for the latest driver.
 
I run dual 4850's on a OCZ 550w PSU with no problems..


onick said:
hehe! surprised to see no one mentioned it yet. 4890 has its own set of drivers which is different from 4800 series driver. you need to install driver for 4890. check amd's site for the latest driver.
Click to expand...

No, it's the same driver. Picking 4800 series or 4890 both takes you to the exact same page to download the exact same file.
 
wolf2009 said:
cm 600w slient power, oh and it can handle HD 4870x2 + HD 4870. check this review for craziness
Click to expand...

My i7 @ 4.2ghz + 4850x2 + 4850 triple crossfire pushes reads 666W on load (with my monitor, which is estimates about 90w) - so 4870x2 + 4870 must push that 600W PSU to it's limits.
 
Assuming you are running ~80% efficiency your PSU is only putting out 532w. (If you are drawing 666W at the wall socket). So, a 600W is plenty for what he is doing. (Remember a PSU is rated by output, not input)
 
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