Yes, the adapter cable should be included in the box.
ASRock Rack have several boards with this solution. All these boards take only 12V power from the PSU, no 5V and 3.3V anymore (actually almost no 5V). It's similar to (but different from) Intel's ATX12VO standard. Makes the old large 24-pin connector superfluous. While these mainboards are designed for 12V-only power distribution, the adapter cable provides backwards compatibility to conventional ATX PSUs. It merely bridges the power-on signal and has got the 5V standby power pin which supplies the BMC while the rest of the computer is down.
Here is a photo with this adapter but from a different mainboard: servethehome
ASRock Rack have several boards with this solution. All these boards take only 12V power from the PSU, no 5V and 3.3V anymore (actually almost no 5V). It's similar to (but different from) Intel's ATX12VO standard. Makes the old large 24-pin connector superfluous. While these mainboards are designed for 12V-only power distribution, the adapter cable provides backwards compatibility to conventional ATX PSUs. It merely bridges the power-on signal and has got the 5V standby power pin which supplies the BMC while the rest of the computer is down.
Here is a photo with this adapter but from a different mainboard: servethehome
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