The following table shows the characteristics of the supported DIMMs. Table cells highlighted with a gray
background indicate when the number of DIMMs per channel still allows the DIMMs to operate at a rated
speed.
Table 5. Maximum memory speeds and capacities
DIMM specification
RDIMM
LRDIMM
Rank
Single rank
Dual rank
Quad rank
Part numbers
46W0784 (4 GB)
46W0788 (8 GB)
46W0792 (8 GB)
46W0796 (16 GB)
95Y4808 (32 GB)
46W0800 (32 GB)
95Y4812 (64 GB)
Rated speed
2133 MHz
2133 MHz
2133 MHz
2133 MHz
Rated voltage
1.2 V
1.2 V
1.2 V
1.2 V
Maximum quantity supported**
24
24
24
24
Maximum DIMM capacity
8 GB
8 GB
32 GB
64 GB
Maximum memory capacity
192 GB
192 GB
768 GB
1.5 TB
Maximum memory at rated
speed
128 GB
128 GB
512 GB
1 TB
Maximum operating speed
1 DIMM per channel
2133 MHz
2133 MHz
2133 MHz
2133 MHz
2 DIMMs per channel
2133 MHz
2133 MHz
2133 MHz
2133 MHz
3 DIMMs per channel
1600 MHz
1600 MHz
1866 MHz
1866 MHz
** The maximum quantity that is supported is shown for two processors installed.
The following table lists memory options available for the x3550 M5 server.
Table 6. Memory options
Part
number
Feature
code
Description
Maximum
supported
Standard models where
used
RDIMMs - 2133 MHz
46W0784
A5B6
4GB TruDDR4 Memory (1Rx8, 1.2V) PC4-
17000 CL15 2133MHz LP RDIMM
24 (12 per
CPU)
-
46W0788
A5B5
8GB TruDDR4 Memory (1Rx4, 1.2V) PC4-
17000 CL15 2133MHz LP RDIMM
24 (12 per
CPU)
-
46W0792
A5B8
8GB TruDDR4 Memory (2Rx8, 1.2V) PC4-
17000 CL15 2133MHz LP RDIMM
24 (12 per
CPU)
A2x, B2x
46W0796
A5B7
16GB TruDDR4 Memory (2Rx4, 1.2V) PC4-
17000 CL15 2133MHz LP RDIMM
24 (12 per
CPU)
62x, C2x, C4x, D2x, F2x,
G2x, H2x, J2x, L2x, M2x,
N2x, P2x, Q2x
95Y4808
A5UJ
32GB TruDDR4 Memory (2Rx4, 1.2V) PC4-
17000 CL15 2133MHz LP RDIMM
24 (12 per
CPU)
-
LRDIMMs - 2133 MHz
46W0800
A5B9
32GB TruDDR4 Memory (4Rx4, 1.2V)
PC417000 CL15 2133MHz LP LRDIMM
24 (12 per
CPU)
-
95Y4812
A5UK
64GB TruDDR4 Memory (4Rx4,1.2V) PC4-
17000 CL15 2133MHz LP LRDIMM
24 (12 per
CPU)
-
Lenovo System x3550 M5 (E5-2600 v3)
13