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All DIMMs in all CPU memory channels operate at the same speed, which is determined as the



lowest value of the following factors:

Memory speed that is supported by the specific CPU.



Lowest maximum operating speed for the selected memory configuration that depends on rated



speed, as shown in the "Maximum operating speed" section in the following table. The shaded

cells indicate that the speed indicated is the maximum that the DIMM allows.

The following table shows the maximum memory speeds that are achievable based on the installed

DIMMs and the number of DIMMs per channel. The table also shows the maximum memory capacity at

any speed that is supported by the DIMM and maximum memory capacity at rated DIMM speed. In the

table, cells that are highlighted in gray indicate when the specific combination of DIMM voltage and

number of DIMMs per channel still allows the DIMMs to operate at the rated speed.

Table 8. Maximum memory speeds

Specification RDIMMs LRDIMMs

Rank Single rank Dual rank Quad rank

Part numbers 46W0784 (4 GB)

46W0788 (8 GB)

46W0792 (8 GB)

95Y4821 (16 GB)

95Y4808 (32 GB)

46W0800 (32 GB)

95Y4812 (64 GB)

Rated speed 2133 MHz 2133 MHz 2133 MHz

Rated voltage 1.2 V 1.2 V 1.2 V

Operating voltage 1.2 V 1.2 V 1.2 V

Maximum quantity* 24 24 24

Largest DIMM 8 GB 16 GB 64 GB

Max memory capacity 192 GB 384 GB 1.5 TB

Max memory at rated

speed

128 GB 256 GB 1.0 TB

Maximum operating speed (MHz)

One DIMM per channel 2133 MHz 2133 MHz 2133 MHz

Two DIMMs per channel 2133 MHz 2133 MHz† 2133 MHz†

Three DIMMs per channel 1600 MHz 1600 MHz 1866 MHz†

* The maximum quantity that is supported is shown for two processors that are installed. When one processor is

installed, the maximum quantity that is supported is half of that shown.

† This speed is achieved only when Lenovo TruDDR4 memory is used

The following memory protection technologies are supported:

ECC



Memory mirroring



Memory sparing



If memory mirroring is used, DIMMs must be installed in pairs (minimum of one pair per CPU), and both

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

If memory rank sparing is used, 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 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 that are installed.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 39 40

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