Dell EMC PowerEdge R7425, Инструкция по установке и обслуживанию

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General memory module installation guidelines
NOTE: If your system's memory configurations fail to observe these guidelines, your system might not boot, might stop
responding during memory configuration, or might operate with reduced memory.
The system supports Flexible Memory Configuration, enabling the system to be configured and run in any valid chipset architectural
configuration. The following are the recommended guidelines for installing memory modules:
• RDIMMs and LRDIMMs must not be mixed.
• x4 and x8 DRAM based memory modules cannot be mixed.
• Populate memory module sockets only if a processor is installed. For single-processor systems, sockets A1 to A16 are available. For dual-
processor systems, sockets A1 to A16 and sockets B1 to B16 are available.
• Populate all the sockets with white release tabs first, followed by the black release tabs.
• 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 is not supported.
• Populate eight memory modules per processor (one DIMM per channel) at a time to maximize performance.
NOTE: For optimal performance, it is recommended to populate one DIMM per channel with DDR4, 2666 MT/s memory modules
on the first slot of each memory channel. The first slot of each channel can be identified as the DIMM slots with white latches.
For example, 64 GB system memory capacity can be divided into 8 x 8 GB DIMM slots.
Mode-specific guidelines
Eight memory channels are allocated to each processor. The configurations allowed depend on the memory mode selected.
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.
Table 44. Memory optimized (independent channel) mode
Processor Configuration Memory population rules Memory population
information
Single CPU Optimized (independent
channel) population
order 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
13, 14, 15, 16 Populate in this order,
odd amount of DIMMs
per CPU allowed.
Dual CPU (Starting with CPU1, CPU1 and CPU2
population should match) Optimized (independent
channel) population
order C1{1}, C2{1}, C1{2}, C2{2},
C1{3}, C2{3}… Odd amount of DIMM
slots per CPU allowed.
Removing a memory module
Prerequisites
1 Follow the safety guidelines listed in Safety instructions .
2 Follow the procedure listed in Before working inside your system .
3 Remove the air shroud .
104 Installing and removing system components