Regarding audio sa Video cards, same lang ba compared to using dedicated audio cards? It's more convenient than having a sound card for me.
If you're using a video card with proper HD audio support, wala dapat kaso sa audio versus the HDMI audio adapters ng Asus and Auzentech + your 4850 basta wala kang compatibility issue.
High Jitter interface ang HDMI to begin with, so mas malaking factor ay ang receiving end kung particular ka sa sound quality.
Mas mura ang new video card kesa sa HDMI sound adapter, so mas practical siyang solution. You also get better video quality with today's graphics adapters, saka HDMI 1.4a support.