IBM System x3650 M4 HD
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Table 5. Maximum memory speeds (Part 2: UDIMMs and LRDIMMs)
DIMM specification
UDIMM
LRDIMM
Rank
Dual rank
Quad rank
Part number
00D5016 (8 GB)
46W0761 (32 GB)
Rated speed
1600 MHz
1866 MHz
Rated voltage
1.35 V
1.5 V
Operating voltage
1.35 V
1.5 V
1.5 B
Max. qty supported*
16
16
24
Max. DIMM capacity
8 GB
8 GB
32 GB
Max. memory capacity
128 GB
128 GB
768 GB
Max. memory
at rated speed
None
128 GB
256 GB
Maximum operating speed
1 DIMM per channel
1333 MHz
1600 MHz
1866 MHz
2 DIMMs per channel
1333 MHz
1600 MHz
1600 MHz
3 DIMMs per channel
No support
No support
1066 MHz
* The maximum quantity that is supported is shown for two processors installed.
The following memory protection technologies are supported:
ECC
Chipkill (for x4-based memory DIMMs)
Memory mirroring
Memory rank sparing
If memory mirroring is used, DIMMs must be installed in pairs (minimum of one pair per each 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 that are installed.