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OptiPlex 990 Small Form Factor (SFF) Removal Guide for the Memory, Fan Shelter, System fan, Power Switch Cable and Coin Cell Battery | Dell US
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Problems adding RAM to Optiplex 990 Bios Revision A23 - Dell Community
A-Tech 16GB RAM Kit for Dell OptiPlex 990 MT/DT/SFF - (4 x 4GB) DDR3 1333MHz PC3-10600 Non-ECC DIMM Memory Upgrade at Amazon.com
OptiPlex 990 Ultra Small Form Factor (USFF) Removal Guide for the Wireless Module, Internal Antenna, System Fan, Memory and Heatsink | Dell US
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