Virtually all cards have chipsets made by nVidia or ATI; the different companies (Biostar, Sapphire, etc) just make the cards that integrate the chipset. If you scroll down on the page for the item I sent (the AGP card), you'll see that where it says "chipset," it's listed as ATI.
When you look for a videocard, first figure out what chipset you want, then look for a good quality mfg of cards. Sapphire is crap on lower end cards, but their higher end cards (over $100) are consistently better quality for the money. I think they only use ATI chipsets.