Amazon.com: Valley Of The Sun Original 2GB Graphics Video Card GPU Replacement, for Asus G75 Series Laptop G75V G75VW G75VX, NVIDIA GeForce GTX 660M 670M N13E-GE-A2 GDDR5 2 GB, MXM VGA Board
EVGA GeForce GTX 660 SuperClocked 02G-P4-2662-KR G-SYNC Support 2GB GDDR5 PCI Express 3.0 x16 HDCP Ready SLI Support Video Card - Newegg.com