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Dell PowerEdge M910 Technical Guide 22
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. See Table 8 for DIMM naming and
population ordering.
7.3 Slots /Risers
For information, see System Memory in the Dell PowerEdge Modular Systems Hardware Owner’s
Manual.
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, 5.86, and
6.4 GT/s with 11 Southbound lanes (9 data + 1 CRC + 1 spare) and 14 Northbound lanes (12 data + 1
CRC + 1 spare).
The DDR3 interface supports x4 and x8 single-rank, dual-rank, and quad-rank RDIMMs, and up to 2
RDIMMS per channel. Each DDR3 channel supports a maximum of 8 ranks. DDR3 speeds are 800, 978,
and 1066 MHz. DRAM technology comes in 1 and 2Gb sizes. DIMM capacity is 1, 2, 4, 8, or 16GB (16GB
with QR DIMMS only).
7.5 Memory RAS Support
The Intel Xeon processor 6500 and 7500 series supports high-availability memory modes including
rank and DIMM sparing as well as memory mirroring. The M910 supports rank sparing only and
mirroring as shown in Table 7.
Table 7. PowerEdge M910 Sparing and Mirroring
Sparing
Mirroring
Type
Rules enforced
1P
2P
4P
Rules Enforced
Rank
The capacity of the spare
rank must be greater
than that of any other
rank on the channel
No support
Inter-socket
(hemisphere
mode
enabled)
Inter-
socket
32 DIMM only,
Mirrored must match
7.5.1 Sparing
For information, see System Memory in the Dell PowerEdge Modular Systems Hardware Owner’s
Manual.