Claim: The GeForce 600 series includes the GeForce 610M first launched in December 2011, and the last in the 6xxM series, the GEForce GTX 680MX released in October 2012.
Evidence: Dec 2011 GeForce GT 620M GeForce GT 625M GeForce GT 630M GeForce GT 635M GeForce GT 640M LE GeForce GT 640M GeForce GT 645M GeForce GT 650M GeForce GTX 660M GeForce GTX 670M GeForce GTX 670MX GeForce GTX 675M GeForce GTX 675MX GeForce GTX 680M October 23, 2012