Notes on Rank Sparing mode
– Same numbers mean identical modules (capacity, rank)
– In case of Single-/Dual-Rank memory configurations, at least two 1R or 2R
modules must be populated per a channel.
– In case of Quad-Rank memory modules, please note the following: Due to
performance reasons, always populate a new channel before installing the
3rd memory slot of a channel.
– Only one memory module capacity per CPU is allowed.
If two different memory module capacities have been ordered for Rank
Sparing mode, populate them on different CPUs, so that each CPUs only
comprises modules of one capacity
Example:
12 modules have been ordered, 8 x 4 GB and 4 x 8 GB.
In this case, proceed as follows:
Ê Use the capacity group with more memory modules for CPU 1 and
populate them according to the population sequence for mono CPU
configurations.
Ê Populate the other capacity group on CPU 2 according to the population
rules for mono CPU configurations.
2 UPCUPC 1 UPC UPC
Ch.
A B D C
Ch.
E F H G
DIMM
1A 2A 3A 1B 2B 3B 1D 2D 3D 1C 2C 3C
DIMM
1E 2E 3E 1F 2F 3F 1H 2H 3H 1G 2G 3G
#
Dual CPU configuration
(if modules are of different capacities)
#
Dual CPU configuration
(if modules are of different capacities)
1
1
1
2
2
1 1
2
2 2
3
1 1 1
3
2 2 2
4
1 1 1 1
4
2 2 2 2
5
1 1 1 1 1
5
2 2 2 2 2
6
1 1 1 1 1 1
6
2 2 2 2 2 2
7
1 1 1 1 1 1 1
7
2 2 2 2 2 2 2
8
1 1 1 1 1 1 1 1
8
2 2 2 2 2 2 2 2
9
1 1 1 1 1 1 1 1 1
9
2 2 2 2 2 2 2 2 2
10
1 1 1 1 1 1 1 1 1 1
10
2 2 2 2 2 2 2 2 2 2
11
1 1 1 1 1 1 1 1 1 1 1
11
2 2 2 2 2 2 2 2 2 2 2
12
1 1 1 1 1 1 1 1 1 1 1 1
12
2 2 2 2 2 2 2 2 2 2 2 2
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