Nvidia GeForce GTX 680 specs and images leak - The Verge
Amazon.com: Valley Of The Sun Original GDDR5 2GB Graphics Video Card GPU Replacement for Alienware M15X M17X M18X R1 R2 R3 R4 Gaming Laptop, NVIDIA GeForce GTX 680M 2 GB N13E-GTX-A2 MXM
NVIDIA GeForce GTX 680 2GB Graphics Card Review - Kepler in Motion - PC Perspective