I gave my old HTPC to my sister. It's an AMD Athlon 64 X2 6400 3.2gHz on a ASUS M3N78-EM motherboard with HDMI out. It has 4 GB of RAM. It's using a HD Homerun as a tuner. She says she's getting bad pixelation from the HD NBC channel as well as one of the HD PBS channels. I didn't really have issues other than occasional pixelation, but hers is pretty bad. Would a dedicated video card help? What other possible solutions might there be?