Dell PowerEdge R720 Technical Guide - Page 22

Speed, DIMM type - memory configuration

Get Dell PowerEdge R720 PDF manuals and user guides View all Dell PowerEdge R720 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 22 highlights

Table 8 lists the DIMMs supported on the R720 and R720xd. For the latest information on supported memory, visit Dell.com. Only Capacity Speed (GB) (MT/s) Type Ranks per Data DIMM width SDDC support Voltage 2 1333 RDIMM 1 x8 Advanced ECC 1.35 2 1333 UDIMM 1 x8 Advanced ECC 1.35 2 1600 RDIMM 1 x8 Advanced ECC 1.5 4 1333 RDIMM 2 x8 Advanced ECC 1.35 4 1333 RDIMM 1 x4 All modes 1.35 4 1333 UDIMM 2 x8 Advanced ECC 1.35 4 1600 RDIMM 2 x8 Advanced ECC 1.5 8 1333 RDIMM 2 x4 All modes 1.35 8 1600 RDIMM 2 x4 All modes 1.5 16 1333 RDIMM 2 x4 All modes 1.35 16 1600 RDIMM 2 x4 All modes 1.5 32 1333 LRDIMM 4 x4 All modes 1.35 32 1333 RDIMM 4 x4 All modes 1.35 Flexible memory configurations are supported on the R720 and R720xd, ranging from capacities of 2 GB (minimum) to 768 GB (maximum). The R720 and R720xd support up to 12 DIMMs per processor (up to 24 DIMMs in a dual-processor configuration). Each server has four memory channels per processor, with each channel supporting up to three DIMMs. Both systems support 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 R720 and R720xd:  Up to two quad-rank (QR) DIMMs and up to three dual-rank (DR) or single-rank (SR) DIMMs may be populated per channel.  DIMMs must be installed in each channel, starting with the DIMM farthest from the processor.  DIMMs should be installed with largest rank count to smallest. For example, if DR DIMMS are mixed with SR DIMMs, DR DIMMS should be placed in the lowest DIMM slots, followed by the SR DIMMs. For more information on memory configuration and population, see the Dell PowerEdge R720 and R720xd Systems Owner's Manual on Support.Dell.com/Manuals. 22 PowerEdge R720 and R720xd Technical Guide

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
22
PowerEdge R720 and R720xd Technical Guide
Table 8 lists the DIMMs supported on the R720 and R720xd. For the latest information on supported
memory, visit
Dell.com
.
Only
Capacity
(GB)
Speed
(MT/s)
Type
Ranks per
DIMM
Data
width
SDDC support
Voltage
2
1333
RDIMM
1
x8
Advanced ECC
1.35
2
1333
UDIMM
1
x8
Advanced ECC
1.35
2
1600
RDIMM
1
x8
Advanced ECC
1.5
4
1333
RDIMM
2
x8
Advanced ECC
1.35
4
1333
RDIMM
1
x4
All modes
1.35
4
1333
UDIMM
2
x8
Advanced ECC
1.35
4
1600
RDIMM
2
x8
Advanced ECC
1.5
8
1333
RDIMM
2
x4
All modes
1.35
8
1600
RDIMM
2
x4
All modes
1.5
16
1333
RDIMM
2
x4
All modes
1.35
16
1600
RDIMM
2
x4
All modes
1.5
32
1333
LRDIMM
4
x4
All modes
1.35
32
1333
RDIMM
4
x4
All modes
1.35
Flexible memory configurations are supported on the R720 and R720xd, ranging from capacities of
2 GB (minimum) to 768 GB (maximum). The R720 and R720xd support up to 12 DIMMs per
processor (up to 24 DIMMs in a dual-processor configuration). Each server has four memory
channels per processor, with each channel supporting up to three DIMMs.
Both systems support 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 R720 and R720xd:
Up to two quad-rank (QR) DIMMs and up to three dual-rank (DR) or single-rank (SR) DIMMs may
be populated per channel.
DIMMs must be installed in each channel, starting with the DIMM farthest from the processor.
DIMMs should be installed with largest rank count to smallest. For example, if DR DIMMS are
mixed with SR DIMMs, DR DIMMS should be placed in the lowest DIMM slots, followed by the SR
DIMMs.
For more information on memory configuration and population, see the
Dell PowerEdge R720 and
R720xd Systems
Owner’s Manual
on
Support.Dell.com/Manuals
.