GPU: main players, NVIDIA vs ATI.

How i can see in high performance GPU market there is two main players - NVIDIA and ATI (owned by AMD).
So in next articles i'll analize differenced between NVIDIA and ATI chips.

There is some important terms: chip, technology, graphic card, programming technology.
Thy have different meaning:
chip(GPU) == name of concrete graphics processor.
technology == tecknology of GPU, many GPUs can be done in one technology
graphic card == GPU + other chips on card
programming technology == API or libs or framework or standart for using capabilities of GPU