Operation Manual

Population order Channel Slot number

1 A 3C

2 B 1D

3 A 4A

4 B 2B

For the location of the slot numbers, see DIMM slot locations.

Single and dual-rank DIMMs

To understand and configure memory protection modes properly, an understanding of single and dual-

rank DIMMs is helpful. Some DIMM configuration requirements are based on these classifications.

A single-rank DIMM has one set of memory chips that is accessed while writing to or reading from the

memory. A dual-rank DIMM is similar to having two single-rank DIMMs on the same module, with only

one rank accessible at a time.

Dual-rank DIMMs provide the greatest capacity with the existing memory technology. For example, if

current DRAM technology supports 8-GB single-rank DIMMs, a dual-rank DIMM would be 16 GB.

DIMM identification

To determine DIMM characteristics, use the label attached to the DIMM and the following illustration and

table.

8GB 1Rx4 DDR4-2133P-R

8GB 1Rx4 DD R4- 213 3P-R

Item Description Definition

1 Capacity

8 GB

16 GB

2 Rank

1R = Single-rank

2R = Dual-rank

3 Data width

x4 = 4-bit

x8 = 8-bit

4 Memory generation DDR4

Table Continued

34 Single and dual-rank DIMMs