Memory Features; Memory Speed Limitations - Dell PowerEdge M610x Technical Manual

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7.3 Memory Features

Key features of the M610x memory system include:

Registered (RDIMM) and Unbuffered (UDIMM) ECC DDR3 technology

Each channel carries 64 data and eight ECC bits

Support for up to 96GB of RDIMM memory (with twelve 8 GB RDIMMs)

Support for up to 24 GB of UDIMM memory (with twelve 2 GB UDIMMs)

Support for 1066/1333 MHz single and dual rank DIMMs

Support for 1066 MHz quad rank DIMMs

Single DIMM configuration only with DIMM in socket A1

ODT support (On Die Termination)

Clock gating (CKE) to conserve power when DIMMs are not accessed (DIMMs enter a low-
power self-refresh mode)
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
I C access to SPD EEPROM for access to RDIMM thermal sensors

Single Bit Error Correction

SDDC (Single Device Data Correction – x4 or x8 devices)

Support for Closed Loop Thermal Management on RDIMMs and UDIMMs

Multi Bit Error Detection

Support for Memory Optimized Mode

Support for Advanced ECC mode

Support for Memory Mirroring
Memory sparing is not supported on 5500 series processors. It is supported on systems using 5600
series processors. While 800MHz DIMMs are not supported, the installation of two quad-rank 1066MHz
DIMMs will operate at 800MHz.

7.4 Memory Speed Limitations

The memory frequency is determined by a variety of inputs:

Speed of the DIMMs

Speed supported by the CPU

Configuration of the DIMMs
For quad-rank DIMMs mixed with single- or dual-rank DIMMs, the quad-rank (QR) DIMM needs to be in
the slot with the white ejection tabs (the first DIMM slot in each channel). There is no requirement
for the order of single-rank (SR) and dual-rank (DR) DIMMs.
Table 7 shows the memory populations and the maximum frequency achievable for that
configuration.
Dell PowerEdge M610x Technical Guide 18