Did a nice clean fresh install of Windows 8 on my i7 machine with a Samsung 830 SSD in a removable bay and a Radeon HD 7970. Everything worked well. Had to change the video card to a Radeon HD 5870 as the 7970 had to be used on a different computer. Under no circumstance would Windows 8 finish booting after the switch. It would stall at a silhouette of the Windows logo. I could get it into recovery mode and it could never fix it. Had to use the refresh option to wipe out everything. Yet, on the same computer with a different removable internal boot drive running Windows 7 Pro it had no problem adjusting to the new card. This was strictly a problem with the Windows 8 installation and an inability to handle a common hardware change. Very very lame. My Mac runs Windows better than a PC!