4GB Upgrade for a Dell OptiPlex 380 Desktop System (DDR3 PC3-12800, Non-ECC, ) at Amazon.com
Used Dell Optiplex 380 Small Form Factor Desktop PC with Intel Core 2 Duo 8GB RAM 1TB HDD and Win 7 Pro (Monitor not included) - Walmart.com
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OFFTEK 2GB Replacement Memory RAM Upgrade for Dell OptiPlex 380 (Mini Tower) (DDR3-8500 - Non-ECC) Desktop Memory at Amazon.com
Refurbished Dell Optiplex 380 Desktop PC with Intel Dual-Core Processor, 4GB Memory, 160GB Hard Drive and Windows 10 Pro Monitor Not Included (D380C2D4G160GW10ProKBMI)
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1GB RAM Memory for Dell OptiPlex 380 Small Form Factor (SFF) 240pin PC3-10600 DDR3 DIMM 1333MHz Black Diamond Memory Module Upgrade - Walmart.com
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Refurbished: Dell OptiPlex 380 Desktop Computer Core 2 Duo 3.0GHz 8GB DDR3 RAM 500GB HD DVD-RW Microsoft Windows 7 Professional 64-Bit Desktop Computers - Newegg.com
Dell Optiplex 380/780 Super Fast XP Pro Desktop Computer Core 2 Duo, 3 – RefurbishedPC