Cisco UCS B420 M3 Blade Server
CONFIGURING the SERVER
13
— DIMMs default to performance mode (1.5 V). To run DIMMs in power-savings mode
(1.35 V), change the server BIOS settings.
■
To optimize memory performance:
— Configure DIMMs identically for each CPU
— Fill banks equally across the CPU. See DIMM population guidelines in
Table 24
,
Table 25
, and
Table 26 on page 39
.
— Populate less than 3 DPC
— Select DIMMs with the highest clock speed for a given processor
■
For systems implementing 3-DPC with E5-4600 series processor family CPUs:
— 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)
■
For systems shipping wit E5-4600 v2 series processor family CPUs, DIMM speeds are as shown
in
Table 5
.
For more information regarding memory, see
DIMM and CPU Layout on page 37
.
Table 5 DIMM Speeds for Systems Shipping with E5-4600 v2 Series CPUs
For Systems Shipping with E5-4600 v2 Series CPUs
DIMM
speeds
DPC
1333 Capable v2 CPU
1600 Capable v2 CPU
1866 Capable v2 CPU
LRDIMM
RDIMM
LRDIMM
RDIMM
LRDIMM
RDIMM
1.35V
1.5V
1.35V
1.5V
1.35V
1.5V
1.35V
1.5V
1.35V
1.5V
1.35V
1.5V
1600
DIMM
1DPC
1333
1333
1333
1333
1600
1600
1333
1600
1600
1600
1333
1600
2DPC
1333
1333
1333
1333
1600
1600
1333
1600
1600
1600
1333
1600
3DPC
1066
1066
NA
1066
1066
1066
NA
16 GB -
1333
1066
1066
NA
16 GB -
1333
8 GB -
1066
8 GB -
1066
1866
DIMM
(1.5V only)
1DPC
NA
1333
NA
1333
NA
1600
NA
1600
NA
1866
NA
1866
2DPC
NA
1333
NA
1333
NA
1600
NA
1600
NA
1866
NA
1866
3 DPC
NA
1066
NA
1066
NA
1066
NA
16 GB -
1333
NA
1066
NA
1333
8 GB -
1066