BSOD CrossfireX 6870+6850

-_{MoW}_-Assasi · Nov 10, 2010

I recently got a 6870 to Crossfire with my 6850, but I seem to be running into BSOD problem every time I launch a fullscreen game

I double/triple checked my other parts for stablity
I also tried driversweeper, but to no avail

0x0000003B
atikmdag.sys

Does anyone else seem to have this problem?

EDIT: Driver used is 10.10, theres no older driver that supports this, nor is there a newer driver released

jobrien2001 · Nov 11, 2010

errr is it even possible to CF a 6870 and a 6850?

Brolloks · Nov 11, 2010

Strange, might be a driver issue...the two cards are definately CF compatible

What OS you using?

Khan · Nov 11, 2010

there is a 10.10 hotfix driver for those at AMD's website, if thats not the one you're using you might want to check it out.

-_{MoW}_-Assasi · Nov 14, 2010

Yes, I'm using the 10.10d hotfix, doesn't seem to help
Using Windows 7 x64

Unfortunately, I can't rollback to a previous driver, as 10.10 is the first driver to support the 6 series

Deftee · Nov 14, 2010

Not sure if it'll fix it or not, but there's a 10.10e hotfix now, worth giving a go eh?

http://www.techpowerup.com/downloads/1901/AMD_Catalyst_10.10e_Hotfix.html

-_{MoW}_-Assasi · Nov 14, 2010

No avail I'm afraid

Is it possible to check rail loading on my PSU?

ChanceCoats123 · Nov 14, 2010

You could run OCCT (on the graphics setting) and watch the 12v+ rail graph. Other than that, you'd need a scope.

-_{MoW}_-Assasi · Nov 22, 2010

Well I ran the tests, and it seems the 12v rail holds steady if I load both cards independantly, but it simply refuses to work in Crossfire

I did notice between the 2 cards
The 6870 has single crossfire finger point, whilst the 6850 has two of them

Could this have anything to do with the problem?

OnDborder · Nov 23, 2010

Try to disable the "EnableUlps" in the registry.
It won't hurt anything if it doesn't work.
There should be 2 folders..

-_{MoW}_-Assasi · Nov 24, 2010

I found and disabled about 10 instances of EnableUlps and tried again

Still insta-BSOD with same error

hank123 · Nov 25, 2010

what psu are you running? have you killed your over clock and tried that?

Sgt_Pinto · Nov 25, 2010

yeah i was under the impression it was just due to his immense ******tory.
Now its a long shot but.... have you updated your motherboards bios?

Grief · Nov 25, 2010

try a complete driver wipe, and start from the begining, might be some remenants left from the older drivers.

-_{MoW}_-Assasi · Nov 25, 2010

Sgt_Pinto said:
yeah i was under the impression it was just due to his immense ******tory.
Now its a long shot but.... have you updated your motherboards bios?

Thanks Gilson

BIOS updated, and tried driver cleanup

I'll try getting hold of another PSU to shove into the system to try isolate the problem

Astur · Nov 29, 2010

My advice is...better get the same model..Some ppl got tried this matter before..Most of them they do like ETC: 4870X2 CF 4870/4850...
I dont think it can support for those confugiration...

OnDborder · Nov 29, 2010

Could it be that you might have to install the 6870 first, without the 50, then decrease the clocks to the speed of the 6850. Then install the 50 without the bridge, let the drivers install automatically, shutdown/install bridge, reboot, and then enable crossfire...

What speeds are you running on the cards now?
Maybe the 6850 can't do the 6870 mhz'z?

I'm sure you googled it but this might be looked at.. http://forums.amd.com/game/messageview.cfm?catid=260&threadid=104677

Run>Regedit>HKEY_LOCAL_MACHINE\SYSTEM\ControlSet00 1\Control\Class\{4D36E 968-E325-11CE-BFC1-08002BE10318}

You will have 0000 folder, 0001, 0002... Disable ULPS in all folders that have it.
Only the 0003 and 0004 had the option in mine.

havenaa · Dec 9, 2012

hi community !

i up this topic because i have exactly the same pb !

a screen of GPUZ 6850 and 6870: (note the PCI-E 2.0 x16 @ x 1 2.0 on 6850, i change it to x4 on my Motherboard ASUS P8P67, but still not work)

i try your tips (install 1card first etc... set 6870 to 775mhz with overdrive) but still BSOD.

i have update motherboad bios, try to flash 6850bios but dont fine new rom. try.. install 6850 first, 6870 first, the both, old drivers... i'm bored

plz someone can help me?

BSOD CrossfireX 6870+6850

-_{MoW}_-Assasi

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