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Nvidia GT 640/740 1 GB, 2 GB or 4 GB
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GIGABYTE GT 640 OC Specs | TechPowerUp GPU Database
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EVGA GeForce GT 640 2048MB Review - PCGameBenchmark
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MSI GT 640 V1 Specs | TechPowerUp GPU Database
Nvidia GeForce GT 640 1GB GDDR5 0YG17P PCI Express x16 Desktop Video Card | eBay
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GeForce GT 640 (OEM) | Product Images | GeForce
WinFast GT 640 GDDR5 | Graphics Cards - Leadtek
