Hi Guys, I have the Marvell sata ports on my GB Z77X-UD5H mobo configured as a raid1 array & have no problems with Win 8 x64. When I run Win 8.1 x64 setup (clean install) the array is not seen and attempts to load the preinstall amd64 driver (v.220.127.116.112 or 18.104.22.1688) fail with a compatibility error. I have also tried loading the drivers from the Win 8.1 USB flash drive via an autounattend.xml file but this just hangs. Once Win 8.1 is running, I can add the drivers via device manager & the array is then detected, assigned drive letters and seems to work normally. To avoid having to manually reassign drive letters post install, I'd really like to get the preinstall working. Has anyone had any success with these drivers or know of a way of doctoring the .inf files ???? Thanks.