If it helps any, I have the same card and use a Mini-DP to HDMI adaptor with sound supported. It's 12.95 GBP on amazon, I don't know how much they'd cost in the US, but presumably they'd be cheaper. It works amazingly well, so it's not just a cheap solution. By the way - pretty sure it's not a display port, but a mini display port. Check before you buy.