PNY GeForce GTX 660 Video Card VCGGTX660XPB - Newegg.com
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Used - Very Good: EVGA GeForce GTX 600 SuperClocked GeForce GTX 660 Video Card 02G-P4-2662-KR - Newegg.com
ZOTAC GeForce GTX 660 Video Card ZT-60901-10M - Newegg.com