I haven't had any troubles at all with 8 bit playback on my machine. Have yet to test 10 bit due to lack of software support.
HTPC: Motherboard: Asus F2A85-V, CPU: AMD A10 6800K, RAM: Kingston XMP BEAST 16GB, Samsung 840 EVO 250GB, LG CH12NS30 Blu-Ray drive, Samsung, and WD various 2 and 3TB for storage, Windows 8.1, one for all remote/FLIRC, Logitech z906 surround system.