Howzit man, i'm also still waiting for an answer, when running 15.7.1 on my 7990 crossfire is completely missing. If AMD can at least just confirm the problem is present but no... useless support.
I have the same problem.
Crossfire was working fine in Windows 8.1
Upgraded to Win10, installed the new 15.7.1 driver, and now I have no crossfire
I've uninstalled drivers, cleaned up remains with DDU and fresh installed drivers again, still no luck.
AMD please fix asap!
When you open GPU-Z does it show both GPUs and does it say crossfire is enabled?
Also, you can use GPU-Z to test if crossfire is working by starting up a game or gpu benchmark in windowed mode and then check the load on both gpu cores.
It is now a month ago, and you can not make it to fix the error?
Now I have 2 of the most expensive graphics cards in the world and can not use them?
But now it´s time
No i installed 15.8 Beta, no Crossfire.
what you guys doing?
15.8 Beta driver same problem. Crossfire is completely missing from these new drivers. When reverting back to 15.7 it works fine. Seriously AMD what were you thinking!!!
i have done a rollback to 15.7.1 no changes.
Adapter still disabled and no crossfire option to enable it.
I said 15.7 not 15.7.1
If you revert back to 15.7 crossfire is available again, but 15.7.1 and 15.8 beta removes it. I don't understand why AMD does not give us any clarification on this matter
shadowr, I have tried 15.7, 15.7.1, and 15.8 beta without any progress in enable the crossfire option in the CCC. I used Display Driver Uninstaller each time. I tried 15.7 lastly because you state that crossfire reappeared after doing so but that did not work for me. This is probably the difference between your 7990 crossfire and my R9 295x2.
My brand new build is, free of the press today:
Windows 10 64-bit Professional (Clean Install)
Corsair H105 Water Cooler
ASUS Z170 Deluxe
32GB DDR4 G.SKILL V Series 2666MHz
Samsung 850 Pro 512GB
AMD R9 295x2
1000W Sently PSU
GPU-Z also reflects Crossfire being disabled
I may try a clean install of Windows 8.1 as I believe it was stable on that OS.
I haven't seen a single mention on the web of anyone getting an R9 295x2 to work with crossfire on Windows 10.....3 drivers for Win10 and no fix insight.....
Actually, I may have gotten it! Need to run benchmarks to confirm its working but crossfire is enabled according to the CCC and GPU-Z.
I uninstalled the device drivers using Display Driver Uninstaller, re-installed 15.7 and before I restarted the computer after the installation, I opened CCC and Crossfire was there! I checked to enable it and then restarted (option is still there!).
If the benchmark goes OK I will post back, also I will try 15.7.1 next.