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NVIDIA GeForce GT 640 Specs | TechPowerUp GPU Database
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ASUS GT 640 Formula II Specs | TechPowerUp GPU Database
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GIGABYTE GT 640 OC Specs | TechPowerUp GPU Database
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GT640-2GD3 ASUS GeForce GT 640 2GB 128-Bit DDR3 PCI Express 3.0 HDCP Ready Video
Amazon.com: EVGA GeForce GT 640 2048MB GDDR3 Dual DVI, mHDMI Graphics Cards 02G-P4-2643-KR : Electronics
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