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#### Express Module Configuration Reference

There are 16 express module slots at the rear of the server. The express module slots are numbered from 0–15 (EM0–EM15) from left to right when viewing the server from the rear.

Figure 28 Express Module Configuration Reference

Figure Legend

1 Express module slot 0

2 Express module slot 1

3 Express module slot 2

4 Express module slot 3

5 Express module slot 4

6 Express module slot 5

7 Express module slot 6

8 Express module slot 7

9 Express module slot 8

10 Express module slot 9

11 Express module slot 10

12 Express module slot 11

13 Express module slot 12

14 Express module slot 13

15 Express module slot 14

16 Express module slot 15

All 16 express module slots support cards with the following characteristics:

- Hot-plug express modules

- x8 Gen1 and x8 Gen2 express modules

You can increase the number of express module slots by connecting an I/O expansion unit to the server. The link card used by an I/O expansion unit can connect through express module slots EM2 or EM8 in the server. For a server with a single processor module installed, install the link card used by an I/O expansion unit in express module slot EM8.

Install the express modules in this order (other than the link card used by an I/O expansion unit) to achieve the best order to achieve optimal load balancing.

Server With One Processor Module
Populate these slots first, in this order: | EM0 | EM8 | EM1 | EM9
Populate these slots second, in this order: | EM2 | EM10 | EM3 | EM11
Populate these slots third, in this order: | EM4 | EM12 | EM5 | EM13
Populate these slots fourth, in this order: | EM6 | EM14 | EM7 | EM15
Server With Two Processor Modules
Populate these slots first, in this order: | EM0 | EM8 | EM4 | EM12
Populate these slots second, in this order: | EM1 | EM9 | EM5 | EM13
Populate these slots third, in this order: | EM2 | EM10 | EM6 | EM14
Populate these slots fourth, in this order: | EM3 | EM11 | EM7 | EM15

These guidelines are best practices for load balancing. You might choose to populate the express module slots differently due to LDom or redundant failover considerations.

##### Related Information

- Express Module FRU Paths

- Locate a Faulty Express Module

- Remove an Express Module

- Install an Express Module

- Verify Express Module Functionality

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