Dell DR4000 - Manual (Page 76)

76 Installing System Components
System Memory
Your system supports up to eight dual-rank registered DIMMs (RDIMMs)of
1067 MHz or 1333 MHz.
The system contains eight memory sockets split into two sets of four sockets,
one set per processor. Each four-socket set is organized into three channels.
Two DIMMs for channel 0 and a single DIMM for channel 1 and 2. The first
socket of each channel is marked with white release levers.
Dual-rank RDIMMs of size 4 GB are supported for a total of 32 GB.
General Memory Module Installation Guidelines
To ensure optimal performance of your system, observe the following general
guidelines when configuring your system memory.
NOTE: Memory configurations that fail to observe these guidelines can prevent
your system from starting and producing any video output.
• RDIMMs and UDIMMs cannot be mixed.
• Except for memory channels that are unused, all populated memory
channels must have identical configurations.
• The memory configuration for each processor must be identical.
• Memory modules of different sizes can be mixed in A1-A4 or B1-B4
(for example, 2 GB and 4 GB), but all populated channels must have
identical configurations.
• For Optimizer Mode, memory modules are installed in the numeric order
of the sockets beginning with A1 or B1.
• For Memory Mirroring or Advanced ECC Mode, the channel furthest from
the processor is unused and memory modules are installed beginning with
channel A1 or B1 and proceeding with channel A2 or B2.
• Advanced ECC Mode requires memory modules that use x4 or x8 DRAM
device widths.
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