Dimm Installation Sequence - Lenovo x3550 M4 Installation And Service Manual

Table of Contents

v DIMMs in the server must be the same type (RDIMM, UDIMM, or LRDIMM) to

ensure that the server will operate correctly.

v When you install one quad-rank DIMM in a channel, install it in the DIMM

connector furthest away from the microprocessor.

1. You can install DIMMs for microprocessor 2 as soon as you install

microprocessor 2; you do not have to wait until all of the DIMM slots for

microprocessor 1 are filled.

2. DIMM slots 13-24 are reserved for microprocessor 2; thus, DIMM slots 13-24 are

enabled when microprocessor 2 is installed.

The following illustration shows the location of the DIMM connectors on the

system board.

Figure 35. DIMM connectors location

DIMM installation sequence

Depending on the server model, the server may come with a minimum of one 2

GB or 4 GB DIMM installed in slot 1. When you install additional DIMMs, install

them in the order shown in the following table to optimize system performance.

In general, all three channels on the memory interface for each microprocessor can

be populated in any order and have no matching requirements.

Table 6. Normal mode DIMM installation sequence

Number of installed

microprocessor

One microprocessor

Two microprocessors

DIMM connector population sequence

1, 4, 9, 12, 2, 5, 8, 11, 3, 6, 7, 10

1, 13, 4, 16, 9, 21, 12, 24, 2, 14, 5, 17, 8, 20, 11, 23, 3, 15, 6, 18,

7, 19, 10, 22

Chapter 2. Installing optional devices