IBM 3630 M4 Betriebsanweisung PDF herunterladen (Seite 13)

IBM System x3630 M4 13

Table 4. Maximum memory speeds (Part 2: UDIMMs and LRDIMMs)

DIMM type

Specification

UDIMM LRDIMM

Rank Dual rank Quad rank

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

Max quantity* 12 12 12 12

Largest DIMM 4 GB 4 GB 32 GB 32 GB

Max memory capacity 48 GB 48 GB 384 GB 384 GB

Max memory at rated speed 24 GB 24 GB NS** 192 GB

Maximum operating speed (MHz)

1 DIMM per channel 1333 MHz 1333 MHz 1066 MHz 1333 MHz

2 DIMMs per channel 1066 MHz 1066 MHz 800 MHz 1066 MHz

* Maximum quantity supported is shown for two processors installed. When one processor is installed, the

maximum quantity supported is a half of what is shown.

** Rated speed is not supported. Memory DIMMs always operate at speeds lower than rated.

The following memory protection technologies are supported:

ECC



Chipkill (for x4-based memory DIMMs)



Memory mirroring



Memory rank sparing



Chipkill works only in independent channel mode (the default is operational mode) and supports only

x4-based memory DIMMs.

If memory mirroring is used, then DIMMs must be installed in pairs (a minimum of one pair per each

processor, and a maximum of two pairs per processor), and both DIMMs in a pair must be identical in type

and size.

If memory rank sparing is used, then two single-rank or dual-rank DIMMs must be installed per populated

channel (the DIMMs do not need to be 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.

Chipkill, memory mirroring, and memory rank sparing modes are mutually exclusive. Only one operational

memory mode can be enabled on a server, and it is a system-wide setting.

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IBM 3630 M4 Betriebsanweisung Seite 13