Owners Manual
• In a dual-processor configuration, the memory configuration for each processor should be identical. For example, if you populate
socket A1 for processor 1, then populate socket B1 for processor 2, and so on.
• Memory modules of different capacities can be mixed provided other memory population rules are followed (for example, 4 GB and 8
GB memory modules can be mixed).
• Mixing of more than two memory module capacities in a system is not supported.
• Populate four memory modules per processor (one DIMM per channel) at a time to maximize performance.
Related References
Mode-specific guidelines on page 53
Mode-specific guidelines
Four memory channels are allocated to each processor. The allowable configurations depend on the memory mode selected.
NOTE: You can mix x4 and x8 DRAM based DIMMs to support RAS features. However, all guidelines for specific RAS
features must be followed. x4 DRAM based DIMMs retain Single Device Data Correction (SDDC) in memory optimized
(independent channel) mode. x8 DRAM based DIMMs need Advanced ECC mode to gain SDDC.
Sample memory configurations
The following tables show sample memory configurations for one and two processor configurations that follow the appropriate memory
guidelines.
NOTE: 1R, 2R, and 4R in the following tables indicate single, dual, and quad-rank DIMMs respectively.
Table 21. Memory configurations—single processor
System
capacity (in
GB)
DIMM size
(in GB)
Number of
DIMMs
DIMM rank, organization, and
frequency
DIMM slot population
4 4 1
1R, x8, 2400 MT/s
1R, x8, 2133 MT/s
A1
8 4 2
1R, x8, 2400 MT/s
1R, x8, 2133 MT/s
A1, A2
16 4 4
1R, x8, 2400 MT/s
1R, x8, 2133 MT/s
A1, A2, A3, A4
8 2
1R, x8, 2400 MT/s
1R, x8, 2133 MT/s
A1, A2
24 4 6
1R, x8, 2400 MT/s
1R, x8, 2133 MT/s
A1, A2, A3, A4, A5, A6
48 4 12
1R, x8, 1866 MT/s A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11,
A12
8 6
1R, x8, 2400 MT/s
1R, x8, 2133 MT/s
A1, A2, A3, A4, A5, A6
96 8 12
1R, x8, 1866 MT/s A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11,
A12
16 6
2R, x8, 2400 MT/s
2R, x8, 2133 MT/s
A1, A2, A3, A4, A5, A6
128 16 8
2R, x8, 2400 MT/s A1, A2, A3, A4, A5, A6, A7, A8
Installing and removing system components 53