I tested CrossFire with R7 265 on drivers Crimson 14.7.1 and others versions and it didn't work. I had crashes all games, freezing OS with black screen, etc.
Then I installed AMD Catalyst 15.7.1 and it's ok.
So, maybe anyone AMD's programmer will see this topic and fix this problem. I hope, but not sure.
Asus R7 265, HIS R7 265
Windows 10 x64
LG L227WT, 1680x1050, 60 Hz, DVI
Aerocool Strike-X 600W
Kingston HyperX Fury 2x4 Gb 1866 MHz
I just install second video card with any versions Crimson drivers and I have a problem. OS often freezing with black window, but if it isn't freezing then neither games not runs. But with the Catalyst drivers it's ok. That would not be a problem, but Windows every time updates the drivers.