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Cisco UCS B250 M2 Blade Server
30
SUPPLEMENTAL MATERIAL
Memory Population Recommendations
Memory is organized as three memory channels. CPU 1 has channels A, B, and C, and CPU 2 has channels D,
E, and F. Up to 8 DIMMs can be installed per channel.
E, and F. Up to 8 DIMMs can be installed per channel.
shows how the channels and
banks are laid out for each CPU.
shows the order you must follow when adding matched pairs of DIMMs to channels.
When considering the memory configuration of your server, you should observe the following:
■
Your selected CPU(s) can have some effect on performance. If two CPUs are used, they must
both be of the same type.
both be of the same type.
■
Performance degradation can result from the following:
— Mixing DIMM sizes and densities within a pair is not allowed and both DIMMs in the
pair will be logically removed from the memory array
— Unevenly populating DIMMs between CPUs
gives the recommended memory configurations to optimize performance for the B250 M2 blade
server. The patterns shown in the table form 3-way interleaving across three memory channels to achieve
the highest memory bandwidth.
the highest memory bandwidth.
Table 15
Preferred DIMM Population Order
Number of DIMMs to Install in
a Channel
a Channel
Install DIMMs in These Slot Numbers
1
Notes . . .
1. The slots inside the parentheses are electrically paired with each other, and should be populated
with identically matched DIMMs that were ordered as a pair. Do not swap a paired DIMM with a
DIMM that is not identical in manufacturer part number.
DIMM that is not identical in manufacturer part number.
2
0, 1
4
(0, 1); (4, 5)
8
(0, 1); (4, 5); (2, 3); (6, 7)
Table 16 Recommended B250 M2 Memory Configurations
Total System
Memory Size (GB)
Memory Slot Pairs in Each Channel
(3 channels per processor, a total of 6 channels)
Highest
DIMM
Operation
Speed
Total
DIMMs in
System
Slot Pair (0,1) Slot Pair (2,3)
Slot Pair (4,5) Slot Pair (6,7)
48
8 GB kit x 6
1333 MHz
12
96
8 GB kit x 6
8 GB kit x 6
1333 MHz
24
192
8 GB kit x 6
8 GB kit x 6
8 GB kit x 6
8 GB kit x 6
1333 MHz
48
16 GB kit x 6
16 GB kit x 6
1333 MHz
24