Datasheet

Cisco UCS B420 M3 Blade Server
CONFIGURING the SERVER
11
STEP 3 CHOOSE MEMORY
The standard memory features are:
■ DIMMs
— Clock speed: 1600 MHz
— Ranks per DIMM: up to 4
— Operational voltage: dual (1.5 or 1.35 V); default = 1.5 V
—Registered
■ DDR3 ECC registered DIMMs (RDIMMs) or load-reduced DIMMS (LRDIMMS)
■ Memory is organized with four memory channels per CPU, with up to three DIMMs per
channel (DPC), as shown in
Figure 3.
Figure 3 UCS B420 M3 Memory Organization
CPU 1 CPU 2
48 DIMMS
4 memory channels per CPU
3 DIMMs per channel
CPU 3 CPU 4
Channel A
Channel B
Channel C
Channel D
Channel E
Channel F
Channel G
Channel H
Channel M
Channel N
Channel O
Channel P
Channel I
Channel J
Channel K
Channel L
A0A1A2
B2
C2
D2
I2
J2
K2
I2
M2
N2
O2
P2
E2
F2
G2
H2
B0B1
C0C1
D0D1
Bank 0 Bank 1 Bank 2
E0 E1
F0 F1
G0 G1
H0 H1
Bank 0 Bank 1 Bank 2
Bank 0 Bank 1 Bank 2
M0 M1
N0 N1
O0 O1
P0 P1
I0I1
J0J1
K0K1
I0I1
Bank 0 Bank 1 Bank 2