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x2 4850s in crossfire...help pls?

Last response: in Graphics & Displays
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April 11, 2009 8:22:16 PM

I have 2 ATI Radeon 4850's installed in my MSI x48 motherboard, both in PCI 2.0 x16 slots. The bridge is installed, as well as the latest driver. When checking them out on the device manager, they both come up. However, in the ATI catalyst control center there is supposed to be an option that pops up when it detects 2 graphics cards: a Crossfire option. It wont come up, no matter what i do. Any suggestions?

More about : 4850s crossfire pls

April 11, 2009 9:37:02 PM

Well i do know that sometimes there is an option for enabling/disabling crossfire in the bios. Apart from that, are both cards getting power, all leads attached etc.
Also i know this is daft but you do havethe cards in the correct slots ? (Yes i know but i had to ask) ;)  the blue ones right :kaola: 

Mactronix
April 12, 2009 5:22:49 AM

lol, yeah, the blue ones... Like i said they come up in the Device Manager, so they are all properly running...

Is it possible there's something wrong with the bridge?
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April 12, 2009 6:05:36 AM

Update the VGA driver and see what happens
April 12, 2009 4:37:56 PM

all drivers are up to date, just double checked...
April 12, 2009 8:57:38 PM

The dvi for my monitor is plugged into the 4850 in the PCI 1 slot . The Device manager shows the 4850 in PCI 1 slot enabled, and the 4850 in PCI 2 slot enabled. on CCC (catalyst control center) in the graphics hardware tab its showing the PCI 1 slot enabled as the Primary Adapter. The 4850 in PCI 2 slot is showing in CCC as disabled...

I took out one graphics card at a time to double check that both cards were working and both slots were working...

I'm stumped on this one guys...
April 12, 2009 9:09:12 PM

i had this problem when i first tried crossfire. turned out i just needed to do a thorough cleanout of the drivers in safe mode, running drivercleaner at least 4 or 5 times.

i'm sure its just a rogue part of the old catalysts.

try that and see!
April 12, 2009 9:12:41 PM

k thanks, ill try
April 13, 2009 3:11:24 AM

Running Driver Cleaner Pro 1.5 didnt work...followed directions...ran it a few times...no luck :fou: 
April 13, 2009 4:57:35 AM

Personally by now I would have just formatted the stupid thing ^_^. Anyway check your BIOS to see if you have any settings for crossfire. As mrbobc said, it's probably just some rouge file or registry setting mucking everything up.
April 13, 2009 12:14:28 PM

cowykillr said:
Running Driver Cleaner Pro 1.5 didnt work...followed directions...ran it a few times...no luck :fou: 


did you try it in safe mode?? its the only way it'll get rid of the files properly. if u havent do it in safe mode a few times then reboot/reinstall.

you could also try going into device manager and uninstalling the 2 cards from there after uninstalling ccc (dont worry you wont lose your screen) then reboot and install the new drivers :) 

sometimes you just have to do a fresh install of windows if u cant get rid of the problem like megaman said. if you have no problem reinstalling windows then do that AFTER trying everything else first.
April 14, 2009 7:48:58 AM

The only way to get this to work is to roll back to catalyst 8.10 (about 6 months old) , i know this because i had the EXACT same problem with my two 4850's. and the performance with 8.10 is terrible too. i get the exact amout of fps in warhammer with the single 8800 gtx i borrowed from a friend. this month's drivers (9.4) were the last straw, they did nothing to fix the issue. i have sold off my two 4850's and picked up a gtx 280. . if you browse the ati forums you'll see that you are not alone with this and it is pretty common. just to clear the air too, i am not a fan boy, i go where the price/performance is... but after having this issue for the past SIX MONTHS i am done with ati.
April 14, 2009 8:24:12 AM

o yea btw, i tested on an AM3 790x mobo, and the ASUS pk5-e, didn't matter what chipset i was using it still didn't work
April 14, 2009 11:57:22 PM

hey, thanks guys...this has been driving me insane for quite some time....ccc 8.10 you say?

and yes, i did use the DRiver Cleaner in safe mode...
April 15, 2009 12:54:26 AM

cowykillr said:
hey, thanks guys...this has been driving me insane for quite some time....ccc 8.10 you say?

and yes, i did use the DRiver Cleaner in safe mode...


It's highly unlikely that using 8.10 will fix your issue. You should use Cat driver 9.1 and newer, since ATI improved their drivers for crossfire starting from 9.1

I would say that your issue is most likely lack of power from the PSU or a bad Crossfire bridge.
April 15, 2009 2:26:39 AM

I have this same problem with 2xHD4850's, and the only drivers that give crossfire is 8.10. I heard this is a bios issue, because some companies thought it would be cool to put old bios on the cards. So if anyone has a fix please help. I really don't want to flash bios though...
April 15, 2009 11:01:48 AM

idk if installing broken ass drivers from six months ago (catalyst 8.10) is honestly a fix, but it allowed me to enable and crossfire and see no real performance gain, get frustrated and sell my cards off (like a boss!)
April 15, 2009 11:11:08 AM

and in addition to having both a amd and an intel chipset to test it on, i also had three diff crossfire bridges, two diff pwr supplies (corsair hx620 and a ocz gamestream 700w). so believe me when i say that the ONLY fix i found was to roll back to 8.10 and below.
April 15, 2009 1:27:13 PM

Than it has to be an older BIOS as SP3CIALAG3NTBOB said.
Call the manufacturer and tell tehm to either give you a newer BIOS or RMA the cards and get new ones. Although in small number, apparently this does happen.... knock on wood, I havent experienced yet any problems in Crossfire, but everything is possible.
April 15, 2009 4:43:13 PM

see, i have the MSI x48 Platinum MoBo...and ive been reading the manual with it...it says that the MoBo is already crossfire ready and nothing needs to be changed in the BIOS for it...it states that its all involved with the Driver and software like CCC for example...
April 15, 2009 4:44:33 PM

Euphoria_MK said:
It's highly unlikely that using 8.10 will fix your issue. You should use Cat driver 9.1 and newer, since ATI improved their drivers for crossfire starting from 9.1

I would say that your issue is most likely lack of power from the PSU or a bad Crossfire bridge.



Ive got enough power from my psu: 750w
April 16, 2009 1:06:53 AM

did u try uninstalling the cards in device manager? it has worked for me when all else has failed!

if you have then a fresh install of windows is the only way you'll know if its a driver issue or a hardware issue.
April 16, 2009 1:44:20 AM

I'm just going to do a fresh install of vista.... garrrrrr....pissed...
April 24, 2009 7:50:59 AM

Gahhhh, alright, 2 weeks later after i made a whoopsie...in the process of flashing my BIOS, one of my sticks of RAM decided to die on me...

I now have an updated bios, a fresh install of vista, latest driver for my radeon 4850, bridges connected properly and identified in my device manager, crossfire is already enabled in bios...

what the freaking hell could be the problem now?????
April 24, 2009 8:33:16 AM

cowykillr said:
graphics cards: a Crossfire option. It wont come up..


Make sure yo plug the crossfire cable at the top of the cards and try again..

I was talking about the weakness of 4870X2 drivers but the close my thread.. they think that I hate Ati!!

I'm a customer of Ati and I bought many of their products but I meant no harm when I said that some of their products are still in developing (not ready for public use).

By the way.. did you face any crashes during the drivers installation with 4850 card?
April 24, 2009 9:23:30 AM

cowy... It looks as though you've tried everything suggested, other than calling the card manufacturer and telling them the dang things aren't working correctly. Maybe it's time to do that.

Have them troubleshoot it, as they have the most experience with their own particular hardware. Bring up the point expressed here about the card BIOS, and have them RMA'd if they can't get 'em to work. You can also try contacting MSI since they're installed on their mobo. Perhaps they have a beta BIOS or some trick that isn't covered in the manual to get it to work correctly.
April 24, 2009 5:15:15 PM

Di7 said:
Make sure yo plug the crossfire cable at the top of the cards and try again..

I was talking about the weakness of 4870X2 drivers but the close my thread.. they think that I hate Ati!!

I'm a customer of Ati and I bought many of their products but I meant no harm when I said that some of their products are still in developing (not ready for public use).

By the way.. did you face any crashes during the drivers installation with 4850 card?



nopers, no crashes
April 24, 2009 8:03:08 PM

This happened with my 4850s in crossfire. I plugged in both cards without the crossfire connection, booted up, device manager read them both. then i shut down, plugged the crossfire connection on the top of both cards, booted up and still CCC didnt give the crossfire option. I didnt change any connections after but I did one more reboot and it gave me the option after that. Only difference here is I'm on xp32~
April 24, 2009 8:48:50 PM

ya, i had gotten the vista 64....

now this might be a stretch of the imagination, but i might just have to wait till windows 7 comes out...ive heard decent things about it...maybe its somethin w/ this OS
!