4GB kit (2GBx2) Upgrade for a Dell OptiPlex 330 System (DDR2 PC2-6400, Non-ECC, ) at Amazon.com
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Dell Optiplex 780 Windows 10 Pro Desktop PC Tower Core 2 Duo 3.0GHz Processor 8GB RAM 500GB Hard Drive DVD-RW Wifi with a 22" LCD-Used Computer - Walmart.com
Dell Optiplex 330 MT Intel Core 2 Duo E4400 2GHz 2GB RAM No HDD No OS | eBay