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4GB 2X2GB RAM Memory for Dell OptiPlex 745 Mini Tower DDR2 DIMM 240pin PC2-4200 533MHz Black Diamond Memory Module Upgrade - Newegg.com
Memory: Dell OptiPlex 745 User's Guide
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OFFTEK 2GB Replacement Memory RAM Upgrade for Dell OptiPlex 745 (Desktop MiniTower and Small Form Factor) (DDR2-5300 - Non-ECC) Desktop Memory at Amazon.com
Dell Optiplex 745 Small Form Factor RAM Replacement - iFixit Repair Guide
CMS 8GB (4X2GB) DDR2 6400 800MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 745, 745C Series Desktop - A92 at Amazon.com
8GB 4X2GB Dell OptiPlex 745 DDR2 PC2-5300 Memory at Amazon.com
FULenQnu Technology 4GB kit (2GBx2) Upgrade for a Dell OptiPlex 745 Series (Desktop Mini-Tower and Small Form Factor) System (DDR2 PC2-6400 Non-ECC) - Walmart.com
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Dell Optiplex 745 Small Form Factor Repair - iFixit