Memory; Dimms Supported; Dimm Slots; Intel 7500 Smb - Dell PowerEdge M910 Technical Manual

7 Memory

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 7500 SMB. A memory buffer has
two DDR3 channels. Each of these channels can support up to two DIMMs running at 1067MT/s (or
slower) speeds.
The Intel 7500 SMB supports single-, dual- and quad-rank DIMMs. Up to four 2GB, 4GB, 8GB, 16GB
and 32GB RDIMMs are supported per channel, for a total of up to 1TB. 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.
Four-socket platform capability (32 DIMMs):

Up to eight DDR3 DIMMs per socket through use of up to four scalable memory buffers

Support for up to 32GB DDR3 DIMMs

Maximum of 1TB with 32GB DIMMs
Memory types supported:

1066MT/s DDR3 (800 and 1333 MT/s availability depends on OEM validation)

RDIMM

Single-rank (SR), dual-rank (DR), quad-rank (QR)
Actual system memory speed depends on specific processor capabilities:

6.4GT/s SMI link speed capable of running memory speeds up to 1066MT/s

5.86GT/s SMI link speed capable of running memory speeds up to 978MT/s

4.8GT/s SMI link speed capable of running memory speeds up to 800MT/s

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.

DIMM slots

For information, see the System Memory section in the Installing Blade Components chapter of the
Dell PowerEdge Modular Systems Hardware Owner's Manual

Intel 7500 SMB

The Intel 7500 SMB supports one Intel Scalable Memory Interconnect (Intel SMI), two DDR3
channels and one SMBus slave interface at 100KHz. It does not support the repeater functionality.
Target package size is 19.5 mm x 24.5 mm with 0.8 mm pitch. Intel SMI supports link speeds of
PowerEdge M910 Technical Guide
on Dell.com/Support/Manuals.
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