Kepler comes of age: NVIDIA unveils GeForce GTX 680 desktop GPU, 600M series for laptops | Engadget
NVIDIA Announces the GeForce GTX 660 Ti | TechPowerUp Forums
ZOTAC Continues GeForce 600 Series Momentum With New GeForce GT 640 | TechPowerUp
NVIDIA GeForce 600 Series GTX 680, GTX 670 and GTX 660 Ti Reach End-Of-Life
Goodbye Kepler: NVIDIA announces that GeForce GTX 600 and 700 series cards will stop receiving new Game Ready Drivers from August 2021 - NotebookCheck.net News
It's official, Nvidia will stop supporting GTX 600 and 700 GPUs from October | Rock Paper Shotgun