It looks like GeForce GT 630, and two variants GT 640 128-bit are brand new Kepler graphics cards. GeForce GT 645 is a refreshed GeForce GTX 560 SE. I’m not sure at the moment which GPUs are those cards using (NVIDIA didn’t provide such information).
NVIDIA adds low-end GeForce 600 cards for OEMs
Posted on Wednesday, April 25 2012 @ 21:56 CEST by Thomas De Maesschalck
VideoCards reports NVIDIA has introduced new low-end GeForce 600 series graphics cards for OEMs. Some of these models are rebrands of Fermi, while others are new parts.