I kid you not. I am in the process of changing all of my rigs from Simplmining.net over to windows 10.
my MB is the Asrock Z97 extreme4 which I am a big fan of as I have had zero dramas with them.
In this rig I have 4x Sapphire Nitro RX 480 8GB (non plus) and 2x Powercolor Red Dragon RX 480 8gb. I accidentally installed the RX 580 drivers and thought that it would nothing more than an inconvenience to reinstall the correct drivers and start mining. Well I was wrong, the Sapphire cards were fine but the powercolor cards work in windows but the GPU's can't be detected by claymores.
MSI Afterburner, watttools etc don't show any clock speeds in the display. GPU-Z does though.
There have been no BIOS mods on these cards. I have checked in Polaris editor to see if it all looks legit and everything seems fine.