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
A0
A1
A2
B2
C2
D2
I2
J2
K2
I2
M2
N2
O2
P2
E2
F2
G2
H2
B0
B1
C0
C1
D0
D1
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
I0
I1
J0
J1
K0
K1
I0
I1
Bank 0
Bank 1
Bank 2
