You might have more luck looking for an adapter or cable that converts HDMI or DVI to component.
EDIT: I don't think I've ever seen a motherboard or standard graphics card that does component out.
Further edit: I'd try looking at monoprice.com for converters. I found a few in a quick search, though I'm not convinced they're exactly like what you're looking for. Alternatively, you could see about salvaging one from a PS3, as I believe there's an option to buy an HDMI -> component cable, and it should work, since the PS3 uses plain old HDMI rather than a proprietary output.