First to know installation is from USB.I make it with Rufus,so use all settings for uefi motherboard(GPT scheme and FAT32 format).When I start with installation "Windows loading files" it's ok but when "Starting windows" come it freeze when 4 colors are coming.I tried so many times and always freeze at same place.With CSM boot it is not problem,all go good(of course MBR scheme and NTFS format).
And yea there is no problem installing Win 8.1 on UEFI,just with Win 7
And yea there is no problem installing Win 8.1 on UEFI,just with Win 7