A brief short news about Nvidia and ATI :

Nvidia enlarged its market share in the graphics market and became the leader. It is said to be Nvidia sold nearly 26 million products for the second quarter, this means Nvidia nearly has %32 of the Market. AMD ATI sold 15 million products and having %19 of the market, last year AMD ATI sold nearly 19 million products.

News Source : www.extremetech.com

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