System Memory; General Memory Module Installation Guidelines; Mode-Specific Guidelines - Dell EMC DSS 9600 Installation And Service Manual

• Phillips #2 screwdriver
• 1/4 inch flat head screwdriver
• Torx #T20 screwdriver
• Torx #T30 screwdriver
• Torx #T6, #T8, #T10, and #T15 screwdrivers
• Wrist grounding strap
You need the following tools to assemble the cables for a DC power supply unit.
• AMP 90871-1 hand-crimping tool or equivalent
• Tyco Electronics 58433-3 or equivalent
• Wire-stripper pliers to remove insulation from size 10 AWG solid or stranded, insulated copper wire
NOTE: Use alpha wire part number 3080 or equivalent (65/30 stranding).

System memory

This section provides information on memory population rules, general requirements and instructions on removing and installing memory
modules.

General memory module installation guidelines

NOTE: Memory configurations that fail to observe these guidelines can prevent your system from booting, stop responding
during memory configuration, or operating 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 can be mixed. For more information, see the Mode-specific guidelines section.
• Both dual-rank and single-rank RDIMMs can be populated in each channel.
• Up to two LRDIMMs can be populated per channel regardless of rank count.
• If memory modules with different speeds are installed, they will operate at the speed of the slowest installed memory module(s) or
slower depending on system DIMM configuration.
• Populate memory module sockets only if a processor is installed. For single-processor systems, sockets A1 to A8 are available. For dual-
processor systems, sockets A1 to A8 and sockets B1 to B8 are available.
• Populate all the sockets with white release tabs first, followed by the black release tabs.
• When mixing memory modules with different capacities, populate the sockets with memory modules with highest capacity first. For
example, if you want to mix 4 GB and 8 GB memory modules, populate 8 GB memory modules in the sockets with white release tabs
and 4 GB memory modules in the sockets with 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 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 six memory modules per processor (one DIMM per channel) at a time to maximize performance.

Mode-specific guidelines

Six memory channels are allocated to each processor. The allowable configurations depend on the memory mode selected.
48 Installing and removing server components