IBM System x3550 M4 13
Table 5. Maximum memory speeds (Part 2: UDIMMs and LRDIMMs)
Specification UDIMMs LRDIMMs
Rank Dual rank Quad rank
Part numbers 49Y1404 (4 GB) 90Y3105 (32 GB)
Rated speed 1333 MHz 1333 MHz
Rated voltage 1.35 V 1.35 V
Operating voltage 1.35 V 1.5 V 1.35 V 1.5 V
Maximum quantity* 16 16 24 24
Largest DIMM 4 GB 4 GB 32 GB 32 GB
Maximum memory
capacity
64 GB 64 GB 768 GB 768 GB
Maximum memory
at rated speed
32 GB 64 GB 256 GB 512 GB
Maximum operating speed (MHz)
1 DIMM per channel 1333 MHz 1333 MHz 1333 MHz 1333 MHz
2 DIMMs per channel 1066 MHz 1333 MHz 1066 MHz 1333 MHz
3 DIMMs per channel Not supported Not supported 1066 MHz 1066 MHz
* Maximum quantity supported is shown for two processors installed. When one processor installed the maximum
quantity supported is a half of shown.
** NS = Not Supported
The following memory protection technologies are supported:
ECC
Chipkill (for x4-based memory DIMMs)
Memory mirroring
Memory rank sparing
If memory mirroring is used, then DIMMs must be installed in pairs (a 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 installed.
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