I've got two similar computers. Both have a 780G chipsest based MB but one of them has an ATI 4550 VC. I played the same MKV h.264 material on both using Windows 7 Media Center. I find that the computer on which I connect my TV to the MB has lower CPU utilization (between 1-6%) than the other one on which I connect to the 4550 (1-18%). Any one else have a similar experience? Both have Catalyst 9.7 are configured pretty much identically.