Chapter 3. IBM System x3850 X5 and x3950 X5 71
Two x3850 X5 servers connected to form a single image 8-socket server. This
configuration is sometimes referred to as a
2-node server.
3.6.1 Memory scalability with MAX5
The MAX5 memory expansion unit permits the x3850 X5 to scale to an additional 32 DDR3
DIMM sockets.
Connecting the single-node x3850 X5 with the MAX5 memory expansion unit uses four QPI
cables, part number 59Y6267, as listed in Table 3-7. Figure 3-13 shows the connectivity.
Figure 3-13 Connecting the MAX5 to a single-node x3850 X5
Connecting the MAX5 to a single-node x3850 X5 requires one IBM MAX5 to x3850 X5 Cable
Kit, which consists of four QPI cables. See Table 3-7.
Table 3-7 Ordering information for the IBM MAX5 to x3850 X5 Cable Kit
3.6.2 Two-node scalability
The 2-node configuration also uses native Intel QPI scaling to create an 8-socket
configuration. The two servers are physically connected to each other with a set of external
QPI cables. The cables are connected to the server through the QPI bays, which are shown in
Figure 3-7 on page 66. Figure 3-14 on page 72 shows the cable routing.
MAX5: The configuration of two nodes with MAX5 is not supported.
Tip: As shown in Figure 3-12 on page 70, you maximize performance when you have four
processors installed because you have four active QPI links to the MAX5. However,
configurations of two and three processors are still supported.
Part number Feature code Description
59Y6267 4192 IBM MAX5 to x3850 X5 Cable Kit (quantity 4 cables)
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