Lenovo 6446, 6447, 6445 Pair, DIMM connectors, 1 1 and 2 7 and 3 2 and 4 8 and 5 3 and 6 9 and

Table 2. DIMM installation sequence

Pair DIMM connectors

11 and 4

27 and 10

32 and 5

48 and 11

53 and 6

69 and 12

Note: When only one pair of DIMMs is installed in the server and the BIOS code level is version 1.04 (GGE127A) or later, you can improve performance by installing the DIMMs in connectors 1 and 7 instead of 1 and 4. However, because the connectors in the pair are not on the same memory branch (see the following illustration), Chipkill memory protection is disabled.

DIMM 12	Channel 3
DIMM 11
DIMM 10
	Branch 1

DIMM 9
DIMM 8	Channel 2
DIMM 7
DIMM 6
DIMM 5	Channel 1
DIMM 4	Branch 0
DIMM 3
	Channel 0
DIMM 2
DIMM 1

vEach DIMM in a pair must be the same size, speed, type, and technology to ensure that the server will operate correctly.

vYou can configure the server to use memory mirroring. Memory mirroring stores data in two pairs of DIMMs simultaneously. If a failure occurs, the memory controller switches from the active pair to the mirroring pair. See “Memory mirroring” on page 13 for more information about memory mirroring and the DIMM installation sequence that is required.

Chapter 2. Installing optional devices 11