Datasheet

Cisco UCS B420 M3 Blade Server

CONFIGURING the SERVER

— Fill banks equally across the CPU. See DIMM population guidelines in Table 23,

Table 24, and Table 25 on page 37.

—Populate less than 3 DPC

— Select DIMMs with the highest clock speed for a given processor

■ For 3 DPC configurations:

— Maximum memory speed 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 more information regarding memory, see DIMM and CPU Layout on page 35.

Supported Configurations

(1) Without memory mirroring:

■ Select from 1 to 12 DIMMs per CPU (note that there are 12 DIMM slots per CPU). There must

be at least 1 DIMM per CPU.

(2) With memory mirroring:

■ Select 4 DIMMs per CPU (installed in bank 0), 8 DIMMs per CPU (installed in banks 0, 1), or 12

DIMMs per CPU (installed in banks 0, 1, 2).