Internal Storage - Lenovo x3500 M5 Product Manual

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Installation and service manual (1236 pages)

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Chipkill works only in independent channel mode (the default is operational mode) and supports only x4-

based memory DIMMs.

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

Both DIMMs in a pair must be identical in type and size.

If memory rank sparing is used, a minimum of one quad-rank LRDIMM or two single-rank or dual-rank

RDIMMs 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.

The following table shows the characteristics of the supported DIMMs. Tables cells that are highlighted

with a gray background indicate when the number of DIMMs per channel still allows the DIMMs to operate

at a rated speed.

Table 7. Maximum memory speeds

DIMM specification

Rank

Part numbers

Rated speed

Rated voltage

Maximum quantity supported*

Maximum DIMM capacity

Maximum memory capacity

Maximum memory at rated speed

Maximum operating speed

1 DIMM per channel

2 DIMMs per channel

3 DIMMs per channel

* The maximum quantity that is supported is shown for two processors installed.