Specifications
18 PowerEdge M620 Technical Guide
Table 7 lists the DIMMs that are supported on the M620. For the latest information on supported
memory, visit Dell.com/PowerEdge.
Table 7. DIMMs supported
Only
Capacity
(GB)
Speed
(MT/s)
Type
Ranks
per
DIMM
Data
width
SDDC support
Voltage
4
1866
RDIMM
1
x8
Advanced ECC
1.5
4
1600
RDIMM
1
x8
Advanced ECC
1.35
4
1600
UDIMM
1
x8
Advanced ECC
1.35
8
1866
RDIMM
1
x4
All modes
1.5
8
1600
RDIMM
1
x4
All modes
1.35
16
1866
RDIMM
2
x4
All modes
1.5
16
1600
RDIMM
2
x4
All modes
1.35
32
1866
LRDIMM
4
x4
All modes
1.5
32
1600
LRDIMM
4
x4
All modes
1.35
32
1333
RDIMM
4
x4
All modes
1.35
Memory configurations
The M620 server supports flexible memory configurations ranging from capacities of 4GB to 768GB
(using 32GB DIMMs) and up to 12 DIMMs per processor (up to 24 DIMMs in a dual-processor
configuration). Each processor has four memory channels, with each channel supporting up to
three DIMMs.
Memory capacity options
The M620 is available in the following memory capacity options:
24-DIMM capacity: uses a 57 mm heatsink and is recommended for use with processors of 95W
or less
20-DIMM capacity: uses a 77 mm heatsink for cooling efficiency and is recommended for use
with 115W and 130W processors
16-DIMM capacity: uses a 97 mm heatsink to support the higher ambient temperatures of Dell
Fresh Air configurations
Flexible memory configuration
The M620 supports a flexible memory configuration according to the following basic rules:
Speed: If DIMMs of different speeds are mixed, all channels across all processors operate at the
slowest DIMM’s common frequency.
DIMM type: Only one type of DIMM is allowed per system: UDIMM, RDIMM or LRDIMM. These
types cannot be mixed.
The following additional memory population guidelines apply to the M620:
Up to two quad-rank (QR) DIMMs and up to three dual-rank (DR) or single-rank (SR) DIMMs may
be populated per channel. Although an LRDIMM is physically a QR DIMM, logic on the LRDIMM
can make it appear as a DR DIMM to the system, allowing up to three LDRIMMs per channel.