I just bought one of these cards for my HTPC. It's a P4 2400 800 with 512 MB of RAM. I use PowerDVD, but I'm getting poor audio with this program and the Radeon. (It's very choppy and sounds like it's lagging the video). The sound card is an Audigy 2. I've tried the latest ATI player (8.6) but it doesn't pass AC3 through the SPDIF. Are there software based players that work with the Radeon/Audigy 2 combo that pass AC3 digitally? The Radeon player sounds fine, but it won't pass AC3 (it's essentially downsampled to Dolby Surround).