Chapter 6. IBM System x3850 X5 and x3950 X5 233
Table 6-3 QPI port relationship to the processor socket
Figure 6-9 shows the back of the x3850 X5 with the attached MAX5.
Figure 6-9 Lab photo of an x3850 X5 (top) attached to a MAX5 (bottom)
6.4.4 Accessing the DIMMs in the MAX5
To add or subtract memory on the MAX5, you can remove the memory tray from the front of
the chassis. Use the following steps to access the DIMMs:
1. Remove ac power from all of the server’s power supplies and from the two MAX5 power
supplies. Because the QPI cables are already held in alignment by the memory expansion
QPI port number Processor socket number
14
23
32
41
Important information about FPGA firmware: When attaching the MAX5 for the first
time, reapply the FPGA firmware using the IMM firmware update tool after the server is
plugged into ac power but prior to powering up the server.
Do not use Bootable Media Creator or USXPI to update the FPGA until the FPGA firmware
is a match between the server and the MAX5. Mismatched FPGA makes the server
unstable and the server can power off during the flash, corrupting the FPGA. This situation
results in hardware replacement, because there is no recovery for corrupt FPGA.
Important power considerations: With the server or MAX5 plugged into ac power and
the scaled units’ power turned off, the QPI cables still have active dc power running
through them. Only unplug or plug in the QPI cable when neither the MAX5 nor the server
is still plugged into ac power. Failure to follow this rule results in damaged circuits on either
the MAX5 memory board or the processor board of the server.
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