Trouble is creative has maybe 10 chipsets that they sell on/off. Then you have the tv-out chip. I don't know if they have standardized, but it could be different for each one.
Geforce has the same trouble. Since it's a different company that puts them together, they each use different tv-out chips on their cards. Some are GREAT.... many suck the big one.
The nice thing about ATI is you know what you get. GREAT quality.... Others you are guessing.
btw, malox also has great tvout... but I dont think the rest of the boards are as good...