6  Front I/O module or PCIe Slot 1-2
One of the following is supported: 
•  Front I/O module
–  For more information about the front I/O module, see “Front I/O module” on page 26.
•  PCIe Slot 1 and slot 2, PCIe x16, FH/FL
–  Install PCIe adapters, particularly network adapters to these slots.
Note: Not available when rear PCIe riser 1 and rear PCIe riser 2 are installed.
7  ESDFF drive bays (bay 0 to 5)
Install EDSFF drives to these bays. See “Install an EDSFF hot-swap drive” on page 241 for more information.
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ThinkSystem SR670 V2 Maintenance Manual