Populating DIMMs for Optimal System Performance

Optimal performance is generally achieved by populating the DIMMs so that the memory is symmetrical, or balanced. Symmetry is achieved by adhering to the following guidelines:

Populate DIMMs of the same size in multiples of twelve (six for each processor).
The DIMM population for each processor (P0 and P1) must be identical.
DIMM channels per processor are arranged from left to right (as you face the front of the system) in the following order:
```
F E D C B A G H I J K L
```

Table 9-2 DIMM Memory Slot Population Requirements

DIMMs per CPU	Channel Population Order	DIMM Memory Slots CPU-0/1
	Memory Channel:	`F E D C B A G H I J K L`
12 DIMMs per CPU	Number Installed	`D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 X X X X X X X X X X X X`
10 DIMMs per CPU	Number Installed	`D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 E X X X X X X X X X X E`
8 DIMMs per CPU	Number Installed	`D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 E X E X X X X X X E X E`
6 DIMMs per CPU	Number Installed	`D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 E E E X X X X X X E E E`
4 DIMMs per CPU	Number Installed	`D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 E E E X E X X E X E E E`
2 DIMMs per CPU	Number Installed	`D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 E E E E E X X E E E E E`
1 DIMM per CPU	Number Installed	`D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 E E E E E X E E E E E E`

Note:

AMD only tests and validates the population ordering documented. Other populations may work but are NOT supported.

Dual or single processor requirements are as follows:

Populating DIMMs in Dual-Processor Systems for Optimal System Performance
Populating DIMMs in Single-Processor Systems for Optimal System Performance

Populating DIMMs in Dual-Processor Systems for Optimal System Performance

In dual-processor systems, install DIMMs into DIMM slots starting with processor 0 (P0) D5, alternating between slots associated with processor 0 (P0) and matching slots for processor 1 (P1).

The following list describes the order in which to install DIMMs in a dual-processor system, which correspond to DIMM slot labels D0 through D11.

DIMM population order on dual-processor systems

P0/D5
P1/D5
P0/D6
P1/D6
P0/D3
P1/D3
P0/D8
P1/D8
P0/D4
P1/D4
P0/D7
P1/D7
P0/D1
P1/D1
P0/D10
P1/D10
P0/D2
P1/D2
P0/D9
P1/D9
P0/D0
P1/D0
P0/D11
P1/D11

Populating DIMMs in Single-Processor Systems for Optimal System Performance

In single-processor systems, install DIMMs only into DIMM slots associated with processor 0 (P0).

The following list describes the order in which to populate DIMMs in a single-processor system, which correspond to DIMM slot labels D0 through D11.

DIMM population order on single-processor systems

P0/D5
P0/D6
P0/D3
P0/D8
P0/D4
P0/D7
P0/D1
P0/D10
P0/D2
P0/D9
P0/D0
P0/D11