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Dell OptiPlex 390 DT vs. Dell OptiPlex 990 DT Comparison
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CMS 8GB (2X4GB) DDR3 10600 1333MHZ NON ECC DIMM Memory Ram Upgrade Compatible with Dell® Optiplex 390 Ddr3 Dimm - A69 - Newegg.com
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OptiPlex 390 Mini Tower (MT) Removal Guide for the Memory, Intrusion Switch, Internal Speaker, Heat Sink Processor and Coin Cell Battery | Dell US
Solved: 390, maximum memory? - Dell Community
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OFFTEK 1GB Replacement Memory RAM Upgrade for Dell OptiPlex 390 (Desktop) (DDR3-10600 - Non-ECC) Desktop Memory at Amazon.com
Dell Optiplex 390 Power Supply Install Replace Upgrade Change - YouTube
