ASUS GTX660 TI-DC2O-2GD5 G-SYNC Support GeForce GTX 660 Ti 2GB 192-Bit GDDR5 PCI Express 3.0 x16 HDCP Ready SLI Support Video Card GPUs / Video Graphics Cards - Newegg.com
Amazon.com: MSI GTX 660 Ti Power Edition Graphics Card with Triple Overvoltage and Enhanced PWM Design (N660TI PE 2GD5/OC) : Electronics