Sorry if this question was already answered. If I have an ATI 5450, should I install the Catalyst or Realtek HDMI driver? I have two HTPCs right now. Both feed into a receiver before going to the TV. One is a 7.1 receiver, the other is a 5.1. Right now I only watch ripped mkv files using 7MC x64 but plan on getting a blu ray drive soon.