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Used - Very Good: EVGA GeForce GTX 600 SuperClocked GeForce GTX 660 Video Card 02G-P4-2662-KR - Newegg.com
MSI GTX 660 OC Specs | TechPowerUp GPU Database
PNY GeForce GTX 660 Video Card VCGGTX660XPB - Newegg.com
Asus Video Card Gtx 660 2gb 192bit Gddr5 Graphics Cards For Nvidia Geforce Gtx660 Used Vga Cards Stronger Than Gtx 750 Ti - Graphics Cards - AliExpress