I spent hours trying to get a svideo to component dongle working on an HD 4550. Turns out the Nvidia and ATI dongles have different pinouts. Had one of these lying around and took a chance. It WORKS!
If you are having trouble you may need to do the following steps. Set the dip switches to 720p out only (you can adjust in software later). You will need to have installed the most recent catalyst drivers. You also need to have anpother display with DVI or VGA output. Load up and find the option that says something like "force component output detection" then reboot. Then you need to tell it to output 720p. Then reboot. Not it won't display anything until windows fully loads, i.e. you won't get any bios message or the windows logo.
However once it loads you are golden. perfect picture (I had to set the oversan to 0%, for some reason it defaults to overscan)
For what it does it cannot be better... and its gold plated.
I am using this to output from PC to standard resolution TV in a MAME cabinet. 480i switch activated only. You are not limited to 480i though since I use 640X432 with the help of a software call PowerStrip. Display can be overscan with 640X480 (cut on top and bottom or left right). 640X432 fixed this on my TV and everything fits on the screen. The closest thing to a real arcade monitor I can get.
This thing is amazing. Best 6 bucks I've ever spent.
I've got a beautiful CRT HDTV here, but it doesn't have HDMI input, just component. My old tower however, coincidentally does have the good ol Radeon 9600 Pro in it. So I got lucky that my TV and video card support each other, but I guess they're both from the same era, so maybe its not THAT big of a coincidence.
Anyways, all I had to do was hook it up, and enable the screen in ATI's Catalyst control center. I'm still futzing around with resolutions to get it to properly fit the screen, but it looks gorgeous at 1980i with 16:9 aspect ratio.
So if you've got a component TV and one of the old Radeon 9x series, its the cheapest fix for HD video out. Don't bother looking for a simple adapter for HDMI to component though. They don't exist. Digital vs Analog there.
This is an excellent device if you have a capable card. Just a note that 1080i only seems to support 30Hz refresh rate on my 9600XT, which is way too low for many displays. However I am running at 1280x720p output with no problems whatsoever (I only have a 720p display anyway). Unlike trying to run via VGA off my video card (1360x768) into the tv which is native 1366x768, this doesn't distort the image at all. Image quality is equal to that of the direct VGA or DVI-toHDMI input. You may need a program like PowerStrip to adjust for overscan (some Media Center type applications allow for this adjustment too).
I have a ATI 4650 HD that is not in the list of approved cards, but took a chance as other customer made it work on cards out of the list (e.g. ATI 3xxx). Unfortunately I couldn't made it works. Anybody could recommend a graphic card (non need of 3D, just good HD component output at 1080i) ?
Works well, just as advertised, with an ATI RADEON 9550. The onepage directions that come with the dongle state this adapter is built for ATI cards, so it won't necessarily work with others.
Note that the DIP switches work as intended, and HD resolutions are output as expected. However, if you intend to watch a commerical DVD from your computer's DVD drive, then you have to drop the output to the dongle to at most 720x480. ATI's FAQ on their dongle states Macrovision licensing limits the output of component video for DVDs to 480i/p.
I'm not entirely certain if the limitation I ran into was from the dongle or my playback software, so this may not be the case for you, but you may have to find a solution to circumvent the limitation in order to watch the movie you purchased through the computer you purchased on the TV you purchased it is your fairuse right.
I needed to connect a DVD player to my auxiliary monitor and this coupling allowed me to do that. Monoprice has been able to supply me with a number of items lately that I couldn't find locally. Item is well made. Shipping was prompt and item well packaged.