Why are within so copious GeForce manufacturer?

I thought the GeForce be a product offered by Nvidia. Like the Explorer is a product offered by Ford. But now that I'm shopping for a up to date video card, I've seen at lowest possible three different manufacturers (Nvidia, EVGA, XFS) that adjectives have products call GeForce XXXX (8600,7900, etc). Can anyone explain why this is? Why are there so lots different manufacturers who submit what looks to be the same ptoduct? Thanks.

Why are within so copious GeForce manufacturer?

GeForce is a graphics processor made by Nvidia.



Nvidia one and only designs and manufactures the graphics processors for video cards. They ship those chips to several manufacturer who then make the actual video cards, thus many brands get the same graphics processor.



They are much approaching Intel who ship their processors to PC makers similar to Dell, HP, Compaq etc.
Outsourcing and Licensing I would expect.
Nvidia is the chipset manufacturer. They provide their GPUs to companies like EVGA who put them on to a video card along next to fans, power, etc. So when you're looking for a card if it say GeForce 8800 GTS that's the GPU. What makes them different is the cooling and the memory. The more memory and the faster the memory the more expensive the card.
Lots of manufacturer offer them because they adjectives think at hand is money to be made selling it. If the market is generous enough later maybe that's true. More companies selling it will administer the consumer more choice and better price competition anyway.