GeForce 9 series
The GeForce 9 series is the ninth generation of Nvidia's GeForce series of graphics processing units , the first of which was released on February 21 , 2008 . 
<triplet> GeForce 9 series <subj> Nvidia <obj> developer <subj> February 21, 2008 <obj> publication date <triplet> GeForce <subj> Nvidia <obj> manufacturer