Cisco UCS C240 M3 High-Density Rack Server (Small Form Factor Disk Drive Model)
SUPPLEMENTAL MATERIAL
51
Recommended Memory Population Order
This section explains the recommended DIMM population order rules for the C240 M3 server.
■ All DIMMs must be DDR3 DIMMs.
■ Mixing of Registered and Unbuffered DIMMs is not allowed per platform.
■ Mixing of ECC and non-ECC DIMMs is not allowed per platform.
■ Mixing of DIMMs with different timing parameters within one channel is allowed.
■ A DDR3-1600 DIMM is allowed only when two DIMM s Per Channel (2DPC) are populated
■ When single and dual rank DIMMs are populated for 3DPC, always populate the dual-rank
DIMM in the blue DIMM slot first (blue slot) and the single-rank DIMM last in the black DIMM
slots.
Follow Table 27 when populating DIMMs in the server.
Table 27 Recommended DIMM Population Order Rules
DIMM Socket DIMM Slot Numbers
BLUE
A1 E1 A1 E1 A1 E1 A1 E1 A1 E1
BLACK
A2 E2 A2 E2 A2 E2
BLACK
A3 E3 A3 E3
BLUE
B1 F1 B1 F1 B1 F1 B1 F1 B1 F1 B1 F1
BLACK
B2 F2 B2 F2 B2 F2 B2 F2
BLACK
B3 F3
Number
o
f
D
I
MMs
Per
C
P
U
2
D
I
MM
s
on
C
P
U1
2
D
I
MM
s
on
C
P
U
2
4
D
I
MM
s
on
C
P
U
1
4
D
I
MM
s
on
C
P
U
2
6
D
I
MM
s
on
C
P
U
2
6
D
I
MM
s
on
C
P
U
2
8
D
I
MM
s
on
C
P
U
1
8
D
I
MM
s
on
C
P
U
2
10
D
I
MM
s
on
C
P
U
2
10
D
I
MM
s
on
C
P
U
2
12
D
I
MM
s
on
C
P
U
1
12
D
I
MM
s
on
C
P
U
2
BLACK
D3 H3
BLACK
D2 H2 D2 H2 D2 H2 D2 H2
BLUE
D1 H1 D1 H1 D1 H1 D1 H1 D1 H1 D1 H1
BLACK
C3 G3 C3 G3
BLACK
C2 G2 C2 G2 C2 G2
BLUE
C1 G1 C1 G1 C1 G1 C1 G1 C1 G1
NOTE: Columns in yellow have DIMM configurations that do not support memory
mirroring. They do, however, offer superior performance. Columns highlighted in
green do support memory mirroring.
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