Crossfire R7 265 w/ HD7850

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Kn3xis

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Jun 16, 2015
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As the title says I am trying to Crossfire these 2 cards. I have been reading on multiple sites that this is possible, unfortunately I am not able to get my setup to work. The 7850 keeps getting Code 43, and after a restart the AMD drivers will not even load.

Things I have tried:
AMD Drivers 14.12, 15.4 Beta, 15.5 Beta
Complete driver wipe using DDU and a reinstall of the drivers

Hardware:
ASUS P8P67 Pro Rev. 3.1
Sapphire Radeon R7 265 Dual-X
ASUS Radeon HD7850 2GB
750W PSU

The cards are connected via an External Crossfire Bridge.

Any assistance in this matter would be great.
 
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does each one work separately? just to make sure the cards are ok.

try running the 7850 as primary and add the 265 instead

edit: make sure you're using the blue and white slots and not the black one, and that you have the latest bios for the motherboard
 
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Both cards are working individually, and I do have them in the correct Blue and white slots. I would try using the R7 265 to support the 7850 but the HDMI port on the 7850 does not output a signal(rest of the card works just fine through DVI), and I run multiple displays. Regardless I will try it when I get home from work tonight and see what I did.
 
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not necessarily as a final solution but try running from 7850 with the 275 as the second card - just to see if it works then.

it's possible the 7850 doesnt initialize properly since the 265 is designed to crossfire without a bridge while the 7850 is not.
 
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When switching the cards around do I put the main card in the top(blue) connector and the supporting card in the lower(grey) connector? Or do I just switch which ones the displays are connected to when I install the drivers?

This is my first time attempting a dual GPU setup, so I am not entirely sure.
 
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I am back with more information. Unfortunately even switching the the slots the cards use and reinstalling the drivers still gives the same issue.

On the plus side the "broken" HDMI port seems to be working, so I am curious as to why I was having problems with that card in the first place.

Anyways, not quite sure what to do. Is it perhaps that this configuration is no longer supported in recent driver updates? The people reporting that it was working were using 13.9 version of the drivers. That is my only guess.
 
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I updated the BIOS on my MOBO and have come into a REALLY big problem.

My computer now BSOD when booting to windows. This includes Safe Mode.

STOP: c000021a FATAL SYSTEM ERROR

Startup repair cannot fix it(I don't think this can fix anything personally)

Should I attempt a complete reinstall of my OS?
Did the BIOS Update brick my MOBO?
 
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I had no custom changes in the BIOS. I looked into it further and tried a few things with no luck. I wiped and reinstalled Windows. I keep my OS on its own SSD, and nothing else so no big loss other than time.
 
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I tried all this, with no luck. When I selected last known good config, I was not getting the chkdsk. I sucked it up and wiped the drive, no biggie. I been planning to do a fresh install soon anyways. I have also given up on the crossfire setup. Figured it was not worth the hassle right now. I just threw the extra card in another PC I had sitting around and have a second, sub-par gaming PC whenever I have company.

Thanks for all the help.
 
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I'm fairly certain all you had to do was set sata to ahci mode mate for your ssd.

Regardingv the crossfire set up mate try using 2 cf bridge cables if you have 2.

I've had problems with cf before & this normally solves it.

Use which ever card has the lower stock core & memory clocks as the primary top slot card.
 
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