PNY VCGGTX660TXPB G-SYNC Support GeForce GTX 660 Ti 2GB 192-Bit GDDR5 PCI Express 3.0 x16 HDCP Ready SLI Support Video Card
Used - Very Good: PNY GeForce GTX 660 Video Card VCGGTX660XPB - Newegg.com
Amazon.com: WWWFZS Graphics Card Fit for ASUS Video Card GTX 660 2GB 192Bit GDDR5 Graphics Cards Fit for NVIDIA Geforce GTX660 VGA Cards Stronger Than GTX 750 Ti : Electronics
Used - Very Good: ASUS GeForce GTX 660 Video Card GTX660-DC2O-2GD5 - Newegg.com