S e n d d o c u m e n t c o m m e n t s t o u c s - d o c f e e d b a c k @ c i s c o . c o m
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Cisco UCS B250 Extended Memory Blade Server Installation and Service Note
OL-22474-03
Memory and Performance
Memory Arrangement
The Extended Memory blade server contains 48 slots for installing DIMMs—24 for each CPU. The
DIMMs for each CPU are divided into 3 channels, and each channel contains 4 pairs of DIMM slots (see
Figure 13
). You must install additional DIMMs in the pairs laid out in
Table 7 on page 26
.
Figure 13
Memory Slots Within the Extended Memory Blade Server
Physical DIMMs and Channels
Each channel is identified by a letter: A, B, C for CPU 1, and D, E, F for CPU 2. Each physical DIMM
is identified by numbers from 0 to 7.
Figure 15
shows how banks and channels are physically laid out on the extended memory blade server.
The DIMM slots in the right are associated with the right CPU, while the DIMM slots in the left are
associated with the left CPU.
When installing DIMMs, you must add them in matched pairs in the configurations shown in
Table 7
:
1
CPU 2 memory channels D, E, and F
2
CPU 1 memory channels A, B, and C
Table 7
Adding DIMMs to a Channel
# of DIMMs to Install in a Channel
Install DIMMs in Channel Slot numbers
2
0, 1
4
(0, 1) – (4, 5)
8
(0, 1) – (4, 5) – (2, 3) – (6, 7)
