SC1 boards are compatible with DCR1 or SC1 miners, but you cannot run both DCR1 and SC1 boards simultaneously. If you decide to place SC1 boards in a DCR1 chassis, you can run a firmware update to install the SC1 firmware. If desired, you can operate a unit with only one hashing board installed.
Additionally, if you have made Obelisk purchases from Batch 1 and later batches, you'll see both upgrade options when you log in to the Obelisk Portal. Gen 1 boards cannot be placed in a Gen 2 unit, and Gen 2 boards cannot be placed in a Gen 1 unit.
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