IBM System x3850 X5 Implementation Guide

Chapter 3. IBM System x3850 X5 and x3950 X5 67
Figure 3-8 shows the QPI Wrap Card.
Figure 3-8 QPI Wrap Card
For single-node systems with three or four processors installed, but without the MAX5
memory expansion unit connected, install two QPI Wrap Cards. Figure 3-9 shows a diagram
of how the QPI Wrap Cards are used to complete the QPI mesh. Although the QPI Wrap
Cards are not mandatory, they provide a performance boost by ensuring that all CPUs are
only one
hop away from each other, as shown in Figure 3-9.
Figure 3-9 Location of QPI Wrap Cards
Tip: The QPI Wrap Cards are only for single-node configurations with three or four
processors installed. They are
not necessary for any of the following items:
򐂰 Single-node configurations with two processors
򐂰 Configurations with MAX5 memory expansion units
򐂰 Two-node configurations
QPI
ports
QPI QPI
QPI QPI
QPI
ports
SMI
links
QPI
links
Intel
Xeon
CPU 3
Intel
Xeon
CPU 1
External
QPI ports
Intel
Xeon
CPU 4
Intel
Xeon
CPU 2
QPI Wrap Card
connection
External
QPI ports
QPI Wrap Card
connection

IBM System x3850 X5 Specifications

General

Processor Cores	Up to 10 cores per processor
Chipset	Intel 7500
Hard Drive Interface	SAS/SATA
Processor	Intel Xeon E7-4800 series, Intel Xeon E7-8800 series
Memory Slots	64 DIMM slots
Storage	Up to 16 x 2.5" hot-swap SAS/SATA HDDs or SSDs
RAID Support	RAID 0, 1, 5, 6, 10
Network Interface	Integrated Gigabit Ethernet
Operating System Support	Microsoft Windows Server, Red Hat Enterprise Linux, SUSE Linux Enterprise Server, VMware vSphere
Form Factor	4U Rack