iXBT Labs - i3DSpeed, September 2013 - NVIDIA GeForce GT 640 2048MB 128-bit GDDR3 (901/1802/1782 MHz)
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Zotac GeForce GT 640 Zone Edition Video Card Review - Legit Reviews
GIGABYTE GT 640 OC Specs | TechPowerUp GPU Database
MSI GeForce GT 640 2GB | VideoCardz.net
Zotac GeForce GT 640 DDR3 Review: Glacial Gaming & Heavenly HTPC
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NVIDIA GeForce GT 640 OEM Rebrand Specs | TechPowerUp GPU Database
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Nvidia GT 640/740 1 GB, 2 GB or 4 GB
GT 640 | ZOTAC
XFX Double D GT 640 Specs | TechPowerUp GPU Database
