Supermicro SuperWorkstation 530A-IL User Manual page 13

Item Description
Slot 2 and 5 PCIe 3.0 x1 (via PCH)
Slot 4 and 7 Two PCIe 4.0 x8/x16 (via CPU), supporting auto switch
Slot 1 5V PCI 32bit
Note: Slot 4 and Slot 7 can be configured as 16/NA or 8/8.
Expansion Slot Locations
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Chapter 1: Introduction