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If you are building a budget retro-gaming rig (Windows 7 era), a pfsense router, or a NAS, this board is a tank. Just download the OptiPlex 390 service manual (PDF) for the specific jumper and pinout layouts.
If you are holding onto a classic Dell OptiPlex 390, 790, or 3010, chances are you are looking at the Dell MIH61R (MB 10097-1) motherboard. This micro-ATX workhorse powered millions of office computers during the Sandy Bridge era.