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NVIDIA GeForce GT 640 review roundup: a $99 card that fails to keep Kepler's promise | Engadget
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GeForce GTX 650 vs GT 640
NVIDIA GeForce GT 640 Specs | TechPowerUp GPU Database
GIGABYTE GT 640 OC Specs | TechPowerUp GPU Database
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GV-N640OC-2GI Overview | Graphics Card - GIGABYTE Global
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MSI GeForce GT 640 OC 2GB review | 52 facts and highlights
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GT 640 | ZOTAC
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GeForce GT 640 (OEM) | Product Images | GeForce
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