User Manual

IBM System x3550 M4 19
Table 5. Maximum memory speeds (Part 3: Intel Xeon processor E5-2600 product family - 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.