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ASUS GT 640 Formula II Specs | TechPowerUp GPU Database
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EVGA GeForce GT 640 2048MB Review - PCGameBenchmark
GIGABYTE GT 640 2 GB Specs | TechPowerUp GPU Database
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Best GT 640 Overclocking Settings Guide - YouTube
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iXBT Labs - i3DSpeed, May 2012 - NVIDIA GeForce GT 640 2048MB 128-bit GDDR3 (901/1802/1782 MHz)
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EVGA - Articles - EVGA GT 640 Graphics Cards
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ECS GeForce GT 640 Testing: Setup & Overclocking - Overclockers Club
