NVIDIA dont actually manafacture graphics cards themselves. What they do is develop the chipset and drivers. There are a bunch of licensed manafacturers who actually make, brand and sell the actual cards. PNY is probably largest and best known of these manafacturers. Dont underestimate them, they are a BIG firm.

For what it's worth, I own an PNY Quadro4 980XGL and I love it.