ASROCK Rack 2U4FH-8L User Manual page 6

Chapter 4 Backplane Specifications
4.1 Hard Drive Backplanes (BPB)
4.2 Front Panel Board (FPB)
4.3 Power Distribution Board (PDB-D)
4.4 PCIE SSD Add-In Card (PE-SSD) (Optional)
4.4 Pin Definitions
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