IBM NeXtScale System Planning And Implementation Manual page 80

Figure 4-3 shows the locations of key components inside the server.
KVM and Mezz card CPU 2 and PCIe 3.0 Drive bay(s)
Ethernet connector four DIMMs riser slot 2
(PCIe Tray only)
PCIe 3.0 SATA port USB hypervisor CPU 1 and Midplane
riser slot 1 and cable socket four DIMMs connector
Figure 4-3 Inside view of the IBM NeXtScale nx360 M4
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IBM NeXtScale System Planning and Implementation Guide