Table 5. Maximum memory speeds
DIMM
specification
RDIMM
LRDIMM
Ranks
Single-rank DIMMs
Dual-rank DIMMs
Quad-rank
LRDIMMs
Part numbers
00D5024 (4 GB)
00D5036 (8 GB)
00D5020 (4
GB)
00D5032 (8
GB)
46W0672(16 GB)
00D5048
(16 GB)
46W0761
(32 GB)
Rated speed
1600 MHz
1866 MHz
1600 MHz
1866
MHz
1866 MHz
Rated voltage
1.35 V
1.5 V
1.35 V
1.5 V
1.5 V
Operating voltage
1.35 V
1.5 V
1.5 V
1.35 V
1.5 V
1.5 V
1.5 V
Max. qty
supported*
48
48
48
48
48
48
48
Max. DIMM
capacity
8 GB
8 GB
8 GB
16 GB
16 GB
16 GB
32 GB
Max. mem.
capacity
384 GB
384 GB
384 GB
768 GB
768 GB
768 GB
1.5 TB
Max memory at
maximum speed
256 GB
256 GB
256 GB
512 GB
768 GB
512 GB
1.0 TB
Max operating speed (MHz)
1 DIMM per
channel
1333
MHz
1600
MHz
1866
MHz
1333
MHz
1600
MHz
1866
MHz
1866
MHz
2 DIMMs per
channel
1600
MHz
1600
MHz
1866 MHz
1600
MHz
1600
MHz
1866
MHz
1866
MHz
3 DIMMs per
channel
1066
MHz
1333
MHz
1333 MHz
1066
MHz
1333
MHz
1333
MHz
1333 MHz
* Maximum quantity supported is shown for four processors installed. When two processors are installed,
the maximum quantity supported is a half of the quantity that is shown. When one processor is installed,
the quantity is one quarter of that shown.
The following memory protection technologies are supported:
ECC
Chipkill (for x4-based memory DIMMs; look for "x4" in the DIMM description)
Memory mirroring
Memory rank sparing
If memory mirroring is used, then DIMMs must be installed in pairs (minimum of one pair per CPU), and
both DIMMs in a pair must be identical in type and size.
If memory rank sparing is used, then a minimum of one quad-rank DIMM or two single-rank or dual-rank
DIMMs must be installed per populated channel (the DIMMs do not need being identical). In rank sparing
mode, one rank of a DIMM in each populated channel is reserved as spare memory. The size of a rank
varies depending on the DIMMs installed.
Internal storage
Lenovo System x3750 M4 (8753)
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