How to Upgrade RAM on Dell Optiplex 320 · Share Your Repair
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1GB RAM Memory Upgrade for Dell Optiplex 320 Mini Tower DDR2-667MHz 240-pin DIMM | eBay
2GB Team High Performance Memory RAM Upgrade Single Stick For Dell OptiPlex 320 320n 330 360 FX160. The Memory Kit comes with Life Time Warranty. at Amazon.com
4GB 2 X 2GB Memory for Dell Optiplex 320 330 740 745 755 PC2-5300 667MHz RAM (PARTS-QUICK ® Brand) at Amazon.com