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3-22
Cisco UCS C420 Server Installation and Service Guide
OL-27640-01
Chapter 3 Maintaining the Server
Installing or Replacing Server Components
DIMM Sockets
Figure 3-13 shows the DIMM sockets on the motherboard.
Each CPU supports four DDR3 memory channels.
Channels are labeled with letters as shown in Figure 3-13.
Each channel has three DIMM sockets. The blue socket in a channel is always socket 1.
Figure 3-13 DIMM and CPU Sockets on the Motherboard
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CPU 3 CPU 2
CPU 4 CPU 1
Front of Server
CPU3
Channel L
CPU2
Channel G
CPU3
Channel M
CPU2
Channel H
L1
L2
L3
M1
M2
M3
G1
G2
G3
H1
H2
H3
CPU3
Channel K
CPU2
Channel F
CPU3
Channel J
CPU2
Channel E
K3
K2
K1
J3
J2
J1
CPU4
Channel R
CPU1
Channel C
CPU4
Channel S
CPU1
Channel D
R1
R2
R3
S1
S2
S3
F3
F2
F1
E3
E2
E1
C1
C2
C3
D1
D2
D3
CPU4
Channel P
CPU1
Channel B
CPU4
Channel N
CPU1
Channel A
P3
P2
P1
N3
N2
N1
B3
B2
B1
A3
A2
A1