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EVGA GeForce GTX 640 4GB vs Zotac GeForce GT 640 1GB: What is the difference?
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EVGA GeForce GT 640 04G-P4-2647-KR Video Card - 4GB DDR3, PCI-Express 3.0(x16), 1x Dual-Link DVI-D, 1x Dual-Link DVI-I, 1x Mini-HDMI, DirectX 12, Single-Slot - 04G-P4-2647-KR at TigerDirect.com
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717540-001 - HP Nvidia Geforce GT 640 4GB PCI Express Graphics Card — Tech Network Supply LLC
NVIDIA GeForce GT 640 Specs | TechPowerUp GPU Database
ASUS GT 640 4 GB Specs | TechPowerUp GPU Database
