IBM x3850 X6 Planning And Implementation Manual page 62

PCIe slots
Internal disks
The x3850 X6 and x3950 X6 servers utilize native QPI scaling capabilities to achieve
4-socket and 8-socket configurations. Unlike eX5 systems, there are no external connectors
and cables for X6 systems, all interconnects are integrated in the midplane.
If you want to upgrade your existing 4-socket x3850 X6 to an 8-socket x3950 X6 and keep
your existing serial number, IBM plans to have a service offering whereby a service engineer
will come onsite with the new mechanical chassis, perform the field upgrade by transferring all
components to the new chassis, and transfer the serial number to the new system.
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IBM System x3850 X6 and x3950 X6 Planning and Implementation Guide
Minimum x3850 X6
configuration
6
4
Maximum x3950 X6
configuration
24
32