Cisco UCS B420 M3 Manual page 13

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To optimize memory performance:
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For systems implementing 3-DPC with E5-4600 series processor family CPUs:
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For systems shipping wit E5-4600 v2 series processor family CPUs, DIMM speeds are as shown
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in Table
Table 5 DIMM Speeds for Systems Shipping with E5-4600 v2 Series CPUs
DIMM DPC 1333 Capable v2 CPU
speeds
LRDIMM
1.35V
1600 1DPC 1333
DIMM
2DPC 1333
3DPC 1066
1866 1DPC NA
DIMM
2DPC NA
(1.5V only)
3 DPC NA
For more information regarding memory, see
Cisco UCS B420 M3 Blade Server
DIMMs default to performance mode (1.5 V). To run DIMMs in power-savings mode
(1.35 V), change the server BIOS settings.
Configure DIMMs identically for each CPU
Fill banks equally across the CPU. See DIMM population guidelines in
Table 25, and Table 26 on page
Populate less than 3 DPC
Select DIMMs with the highest clock speed for a given processor
Maximum memory speed for 1600-MHz DIMMs is 1333 MHz when using 16 GB DIMMs
with E5-4650, E5-4640, or E5-4617 CPUs. Maximum memory speed for all other
configurations is 1066 MHz.
Memory always runs at 1.5 V regardless if the BIOS setting is low-power mode
(1.35 V) or performance mode (1.5 V)
5.
For Systems Shipping with E5-4600 v2 Series CPUs
RDIMM
1.5V 1.35V 1.5V
1333 1333 1333
1333 1333 1333
1066 NA 1066
1333 NA 1333
1333 NA 1333
1066 NA 1066
39.
1600 Capable v2 CPU
LRDIMM RDIMM
1.35V 1.5V 1.35V 1.5V
1600 1600 1333 1600
1600 1600 1333 1600
1066 1066 NA 16 GB -
1333
8 GB -
1066
NA 1600 NA 1600
NA 1600 NA 1600
NA 1066 NA 16 GB -
1333
8 GB -
1066
DIMM and CPU Layout on page
CONFIGURING the SERVER
Table 24,
1866 Capable v2 CPU
LRDIMM RDIMM
1.35V 1.5V 1.35V
1600 1600 1333
1600 1600 1333
1066 1066 NA
NA 1866 NA
NA 1866 NA
NA 1066 NA
37.
1.5V
1600
1600
16 GB -
1333
8 GB -
1066
1866
1866
1333
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