IBM Type 7977 manual v Install the DIMMs in the order shown in the following table

1 and DIMM connector 4. However, the size, speed, type, and technology of the DIMMs that you install in DIMM connector 7 and DIMM connector 10 must match each other.

–The following table shows the DIMM upgrade configuration sequence for operating in non-mirroring mode (normal mode).

Table 3. 5. DIMM upgrade configuration sequence in non-mirroring mode

Number of DIMMs	DIMM connectors
2	1, 4
4	1, 4, 7, 10
6	1, 4, 7, 10, 2, 5
8	1, 4, 7, 10, 2, 5, 8, 11
10	1, 4, 7, 10, 2, 5, 8, 11, 3, 6
12	1, 4, 7, 10, 2, 5, 8, 11, 3, 6, 9, 12

vYou do not have to save new configuration information when you install or remove DIMMs.

vSee the User’s Guide on the IBM System x Documentation CD for more information about memory mirroring and online-spare memory.

The following illustration shows how to install DIMMs on the system board.

DIMM 4
DIMM 3	DIMM 6
DIMM 2		DIMM 10
DIMM 1	DIMM 5	DIMM 7

DIMM 12

DIMM11

DIMM 9

DIMM 8

vInstall the DIMMs in the order shown in the following table.

Table 4. DIMM installation sequence

Memory in Non-mirroring mode		Memory in mirroring mode
Number of DIMMs	DIMM connectors	Number of DIMMs	DIMM connectors
1	1	4	1, 4, 7, 10
2	1, 4	8	1, 4, 7, 10, 2, 5, 8, 11
4	1, 4, 7, 10	12	1, 4, 7, 10, 2, 5, 8, 11,
			3, 6, 9, 12

Chapter 2. Installing optional devices 15