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It's official, Nvidia will end GeForce GTX 600/700 series support in October | PC Gamer
NVIDIA GeForce GTX 660 And GTX 650 Push Kepler To Sub-$110 - SlashGear
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NVIDIA GeForce GT 740 features GK107-425 GPU | VideoCardz.com
GTX 660 vs HD 7950 Game Performance Benchmarks (i7-2700K vs i7-2700K) - GPUCheck United States / USA
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Amazon.in: Buy ZOTAC GeForce GTX 660 2GB Graphics Card (Black/Orange) Online at Low Prices in India | Zotac Reviews & Ratings
Nvidia confirms driver support for Kepler GPUs will end in October | TechSpot