170
Upgrade and Maintenance Manual
BX920
S4
Main memory
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8.1.1.6
Rank Sparing Mode for quad rank (4R) and octa rank (8R)
LRDIMM modules (minimizing waste of spare memory)
I
All empty DIMM sockets must be fitted with dummy DIMMs. Once the
DIMM sockets have been fitted with DIMMs and dummy DIMMs, the air
cowl must be laid over the DIMM slots.
Same numbers mean identical modules (capacity, rank).
CPU
CPU 1
CPU 2
Channel
A
B
C
F
E
D
Slot descriptor
1A
2A 1B
2B 1C
2C
2F
1F
2E
1E
2D 1D
# DIMMS
1 CPU populated
1
1
2
1
1
3
1
1
1
4
1
1
1
1
5
1
1
1
1
1
6
1
1
1
1
1
1
2 CPU populated
2
1
2
3
1
1
2
4
1
1
2
2
5
1
1
1
2
2
6
1
1
1
2
2
2
7
1
1
1
1
2
2
2
8
1
1
1
1
2
2
2
2
9
1
1
1
1
1
2
2
2
2
10
1
1
1
1
1
2
2
2
2
2
11
1
1
1
1
1
1
2
2
2
2
2
12
1
1
1
1
1
1
2
2
2
2
2
2
