Fujitsu PRIMERGY RX900 S2 Upgrade And Maintenance Manual page 358

Appendix
The PCIe slots are assigned as follows:
B: non-hot plug PCIe slots on the PCI Riser
F: non-hot plug PCIe slot for the Modular Raid controller only
G: hot-plug PCIe slots
H: non-hot plug PCIe slots on the baseboard
Figure 249: CPUMEMR numbering scheme
358 Upgrade and Maintenance Manual
RX900 S2