Owners Manual

Table 39. Memory population rules (continued)
Processor Configuration Memory population Memory population information
Fault resilient population
order
A{1, 2, 3, 4, 5, 6},
B{1, 2, 3, 4, 5, 6},
A{7, 8, 9, 10, 11, 12},
B{7, 8, 9, 10, 11, 12}
Supported with 6 or 12 DIMMs per processor.
Table 40. Optimized population rules
Single processor A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12
1 DIMM ✔ – – – – – – – – – – –
2 DIMMs ✔ ✔ – – – – – – – – – –
3 DIMMs ✔ ✔ ✔ – – – – – – – – –
4 DIMMs (Exception
from traditional rules)
✔ ✔ – ✔ ✔ – – – – – – –
5 DIMMs ✔ ✔ ✔ ✔ ✔ – – – – – – –
6 DIMMs
(Recommended for
best performance)
✔ ✔ ✔ ✔ ✔ ✔ – – – – – –
7 DIMMs ✔ ✔ ✔ ✔ ✔ ✔ ✔ – – – – –
8 DIMMs (Exception
from traditional rules)
✔ ✔ – ✔ ✔ – ✔ ✔ – ✔ ✔ –
9 DIMMs ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ – – –
10 DIMMs ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ – –
11 DIMMs ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ –
12 DIMMs ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔
Memory optimized (independent channel) mode
This mode supports Single Device Data Correction (SDDC) only for memory modules that use x4 device width. It does not
impose any specific slot population requirements.
Memory sparing
NOTE: To use memory sparing, this feature must be enabled in BIOS menu of System Setup.
Table 41. Memory sparing
Type Description
Memory sparing (Single Rank) Memory sparing allocates one rank per channel as a spare.
If excessive correctable errors occur in a rank or channel,
they are moved to the spare area while the operating system
is running to prevent errors from causing an uncorrectable
failure. Requires population of two ranks or more per channel.
Memory sparing (Multi Rank) Memory sparing allocates two ranks per channel as a spare.
If excessive correctable errors occur in a rank or channel,
they are moved to the spare area while the operating system
is running to prevent errors from causing an uncorrectable
failure. Requires population of three ranks or more per
channel.
82 Installing and removing system components