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4GB [2x2GB] DDR2-667 (PC2-5300) RAM Memory Upgrade Kit for The Dell Optiplex 755 Desktop (Genuine A-Tech Brand) at Amazon.com
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8GB (4GBx2) Team High Performance Memory RAM Upgrade For Dell OptiPlex 755 Series (Desktop Mini-Tower and Small Form Factor). The Memory Kit comes with Life Time Warranty. at Amazon.com
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