The locations of the expansion slots are shown in the following figure.
Figure 9. Slot locations
The following table lists the available PCIe riser card options.
Table 14. PCIe riser card options
Description Part number
Maximum
supported
Riser card slot 1
Lenovo ThinkServer 1U x8/x8 PCIe Riser Kit (for 2.5-inch drive bay models) 4XF0G45880 1
Lenovo ThinkServer 1U x16 PCIe Riser 2 Kit (for 3.5-inch drive bay models) 4XF0G45878 1
Riser card slot 2 (Requires the second CPU to be installed)
Lenovo ThinkServer 1U x16 PCIe Riser 1 Kit 4XF0G45879 1
Serial port
The COM Cable option, SBB0J78877, is available via CTO for mounting the external serial port on the rear
of the RD550 server, if needed.
For server models with 2.5-inch drive bays, the COM Cable option is mounted in place of the PCIe slot 3,
and only PCIe slots 1 and 2 remain available.
For server models with 3.5-inch drive bays, the COM Cable option is mounted in place of the PCIe slot 2,
and only one PCIe slot (slot 1) remains available.
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