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iXBT Labs - i3DSpeed, May 2012 - NVIDIA GeForce GT 640 2048MB 128-bit GDDR3 (901/1802/1782 MHz)
GV-N640OC-2GI Overview | Graphics Card - GIGABYTE Global
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GT 640 | ZOTAC
Lenovo GTX 650, GTX 750 TI, DELL GT 640 GPU Fan Replacement
