Memory; Overview; Dimms Supported; Dimm Slots - Dell PowerEdge M910 Technical Manual

Dell
7

Memory

7.1 Overview

The PowerEdge M910 uses DDR3 memory providing a high-performance, high-speed memory interface
capable of low-latency response and high throughput. The M910 supports Registered ECC DDR3 DIMMs
(RDIMM) only. Each DDR3 DIMM is driven by the Intel
buffer has two DDR3 channels. Each of these channels can support up to 2 DIMMs running at
1067 MT/s (or slower) speeds.
The Intel 7500 SMB supports single-, dual-, and quad-rank DIMMs. Up to four 2 GB, 4 GB, 8 GB, 16 GB,
and 32 GB RDIMMs are supported per channel, for a total of up to 1 TB. Across processors, DIMM
populations can be different on the memory for each processor as long as the population rules for
each processor socket are followed. Additionally, all processor sockets operate in the same RAS mode
and are set up with the same memory timing parameters.
4-socket platform capability (32 DIMMs):

Up to 8 DDR3 DIMMs per socket through use of up to four Scalable Memory Buffers

Support for up to 32 GB DDR3 DIMMs

Maximum of 1 TB with 32 GB DIMMs
Memory types supported:

1066 MT/s DDR3 (800 and 1333 MT/s availability depends on OEM validation)

Registered DIMM (RDIMM)

Single-rank (SR), dual-rank (DR), quad-rank (QR)
Actual system memory speed depends on specific processor capabilities:

6.4 GT/s SMI link speed capable of running memory speeds up to 1066 MT/s

5.86 GT/s SMI link speed capable of running memory speeds up to 978 MT/s

4.8 GT/s SMI link speed capable of running memory speeds up to 800 MT/s

7.2 DIMMs Supported

If DIMMs of different speeds are mixed, all channels operate at the fastest common frequency.
UDIMMs are not supported. The first DIMM slot in each channel is color‐coded with white ejection
tabs for ease of identification.
The M910's DIMM sockets are placed 0.40‖ apart, center‐to‐center, to provide enough space for
sufficient airflow to cool stacked DIMMs. DIMMs must be installed in each channel starting with the
DIMM farthest from the processor (DIMM 1). Population order is identified by silkscreen and a label.
The order is dependent on the memory configuration used.

7.3 DIMM Slots

For information, see the
Dell PowerEdge Modular Systems Hardware Owner's Manual on Support.Dell.com.

7.4 Intel 7500 Scalable Memory Buffer (SMB)

The Intel 7500 SMB supports one Intel Scalable Memory Interconnect (Intel SMI), 2 DDR3 channels,
and 1 SMBus slave interface at 100KHz. It does not support the repeater functionality. Target
package size is 19.5mm x 24.5mm with 0.8 mm pitch. Intel SMI supports link speeds of 4.8 GT/s, 5.86
PowerEdge M910 Technical Guide
System Memory section in the Installing Blade Components chapter of the
®
7500 Scalable Memory Buffer
(SMB)
. A memory
24