Installed win 8 pro and find it very sluggish and slow (4 weeks installed). Have installed all the latest drivers for system and devices. Running 4 drives (3 win 7 64bit and win 8 64bit). Have no problems with win 7, lot faster than win 8. With current win 8 usage I will not be using this for much longer. Might try again in few months if there are some major updates, win 8 seems to be like vista was, problems for months until a fix came out for issues. None of my children like win 8, this was supposed to be an operating system for their generation but sadly Microsoft seems to have gone for a touchy feel rather than an OS to rival win 7 in performance and stability. No doubt win 8 sp1 will be out in a few months, until then win 8 is consigned to be deleted.