Owners Manual

● In a dual-processor configuration, the memory configuration for each processor must 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 sizes can be mixed provided that other memory population rules are followed (for example, 4
GB and 8 GB memory modules can be mixed).
● Depending on mode-specific guidelines, populate four DIMMs per processor (one DIMM per channel) at a time to maximize
performance. For more information, see the Mode-specific guidelines section.
Table 21. Heat sink — processor configurations
Processor
Configuration
Processor Type (in
Watts)
Heat
Sink
Width
Number of DIMMs
Maximum System
Capacity
Reliability, Availability, and
Serviceability (RAS) Features
Dual processor Up to 105 W, 120 W, or 135
W
74 mm 24 24
Quad processor Up to 105 W, 120 W, or 135
W
74 mm 48 48
NOTE: If you are using a 1.8-inch hard drive/SSD system with four processors, ensure that you use
only 74 mm wide heat sinks for processors up to 105 W, 120 W, or 135 W.
Up to 120 W or 135 W 94 mm 40 (Three DIMMs in channel
0 and channel 2 and two
DIMMs in channel 1 and
channel 3)
32 (Two DIMMs per channel)
NOTE: If you are using a 2.5-inch hard drive/SSD system with four processors, ensure that you
use only 94 mm wide heat sinks for processors up to 120 W or 135 W.
NOTE: When using a 94 mm wide heat sink for quad processors, the memory module sockets A10,
A12, B10, B12, C10, C12, D10, and D12 are not available for population.
Related tasks
Mode-specific guidelines on page 60
Mode-specific guidelines
Four memory channels are allocated to each processor. The allowable configurations depend on the memory mode selected.
Advanced Error Correction Code (lockstep)
Advanced Error Correction Code (ECC) mode extends SDDC from x4 DRAM based DIMMs to both x4 and x8 DRAMs. This
protects against single DRAM chip failures during normal operation.
The installation guidelines for memory modules are as follows:
● Memory modules must be identical in size, speed, and technology.
● DIMMs installed in memory sockets with white release levers must be identical and the same rule applies for sockets with
black release levers. This ensures that identical DIMMs are installed in matched pair —for example, A1 with A2, A3 with A4,
A5 with A6, and so on.
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 System Setup.
60 Installing and removing sled components