You can probably get the adapters at Radioshack, but are you sure that your card only has svideo out? cause I have a Leadtek Gforce 2 and mine with both the ability of Standard RCA and S-video output. But to answer your second question, there is a difference. Or at least for mine there was not so much just watching movies but for using the TV as a monitor with the Svideo text was much much clearer to read.