Dell PowerEdge R815 Specifications download pdf (Page 28)

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Dell PowerEdge R815 Technical Guide

6 Memory

6.1 Overview

The PowerEdge R815 utilizes DDR3 memory which provides a high-performance, high-

speed memory interface capable of low latency response and high throughput. The

platform supports Registered ECC DDR3 DIMMs (RDIMM) and Unbuffered DDR3 DIMMs

(UDIMM).

The memory interface supports memory scrubbing (sequential or redirection) and

patrol scrubbing, single-bit correction and multi-bit error detection. The failure of a

x4 DRAM device results in errors to one ECC symbol and can be corrected (chipkill).

The failure of a x8 DRAM device results in errors to two ECC symbols, and can be

detected but cannot be corrected.

 If DIMMs of different speeds are mixed, all channels will operate at the fastest

common frequency.

 If online sparing is enabled, identical DIMMs must be installed in the same slots

across each channel.

 The first DIMM slot in each channel is color-coded with white ejection tabs for

ease of installation.

 The DIMM sockets are placed 440 mils (11.12 mm) apart, center-to-center in

order to provide enough space for sufficient airflow to cool stacked DIMMs.

 The R815 memory system supports up to 32 DIMMs. Population order is

identified by the silkscreen designator and the System Information Label (SIL)

located on the chassis cover.

6.2 DIMMs Supported

The interface uses 1 GB, 2 GB, 4 GB, 8 GB, and 16 GB RDIMMs and 1 GB and 2 GB

UDIMMs.

The memory interface supports memory demand and patrol scrubbing, single-bit

correction and multi-bit error detection.

6.3 Slots/Risers

The DDR3 memory interface consists of 4 memory channels per processor socket. Each

channel supports up to two RDIMMs for single/dual/quad rank or two UDIMMs. Each

channel is capable of supporting up to two DDR3 memory modules. For more

information, see the System Memory section in the Installing System Components

chapter of the PowerEdge R815 Hardware Owner’s Manual.

6.4 Speed

Each processor has 4 DDR3 channels capable of supporting speeds up to 1333MHz.

Single-, dual-, and mixed- (single and dual) rank DIMM types can support speeds up to

1333MHz.

Quad-rank DIMMs will be available in 2011. Quad-rank DIMMs can support speeds up to

1066MHz.

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Dell PowerEdge R815 Specifications Page 28