Depends on the motherboard. I don't even run a video card in my HTPC, just onboard graphics and it handles QAM and ATSC HD perfectly fine. For just streaming videos and the like from the internet, you more than likely won't need a card, but it really depends on the on board video and the processor. Also, be sure to install the flash 10.1 beta, it will help a lot with Hulu and other flash based sites. List the mobo and processor being used and we can go from there.