I upgraded one of 3 identical intel mombos each with marvel 88se61xx chipset to win8.1 and the system will not boot into windows with any drive attached to the marvel blue or any array or even a single drive to the marvel red SATA connector. Previously all 3 systems worked fine with stardom JBOD enclosures and the port multiplier capability of the marvel. Driver for win7x64 is 1.2.0.7103 and that one is used and recognized by win8 as the "best" driver. The Microsoft IT forum has a post about a 1.2.0.8xxx but there were complaints it didn't work with win7 so it seems to have been withdrawn by Microsoft.
If anyone knows where that 8xxx driver is I can try it else I will revert back to win7x64
Do want to point out that the 7103 driver from the d975xbx2 driver collection works fine with port multipliers and passes S.M.A.R.T data into windows 7x64. Maybe some intern can look into the problem with win8 not booting with any drive attached.
Best Regards