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Lenovo System x3850 X6 and x3950 X6 Quick Start Guide
The Primary I/O board is required in any system. The Primary I/O board hosts the IMM
and UEFI code, as well as the system battery, USB hypervisor port, and the Mezzanine
LAN-on-motherboard generation 2 (ML2) adapter slot. The ML2 slot (Slot 10, as
highlighted in Figure 15) is designed exclusively for ML2 adapters. ML2 network adapter
cards only work in the ML2 slot.
Figure 15 ML2 slot
Slot 10,
ML2 slot