User Guide
Table Of Contents
- Dell PowerEdge R720 and R720xd Owner's Manual
- About Your System
- Using The System Setup and Boot Manager
- Installing System Components
- Recommended Tools
- Front Bezel (Optional)
- Opening And Closing The System
- Inside The System
- Cooling Shroud
- System memory
- Hard Drives
- Removing A 2.5 Inch Hard-Drive Blank
- Installing A 2.5 Inch Hard-Drive Blank
- Removing A 2.5 Inch Hard-Drive Blank (Back)
- Installing A 2.5 Inch Hard-Drive Blank (Back)
- Removing A 3.5 Inch Hard-Drive Blank
- Installing A 3.5 Inch Hard-Drive Blank
- Removing A Hot-Swap Hard Drive
- Installing A Hot-Swap Hard Drive
- Removing A Hard Drive From A Hard-Drive Carrier
- Installing A Hard Drive Into A Hard-Drive Carrier
- Optical Drive (Optional)
- Cooling Fans
- Internal USB Memory Key (Optional)
- PCIe Card Holder
- Top Cover Lock Latch
- Cable Retention Bracket
- Expansion Cards And Expansion-Card Risers
- Expansion Card Installation Guidelines
- Removing An Expansion Card From The Expansion-Card Riser 2 Or 3
- Installing An Expansion Card Into The Expansion-Card Riser 2 Or 3
- Removing An Expansion Card From The Expansion-Card Riser 1
- Installing An Expansion Card Into The Expansion-Card Riser 1
- Removing Expansion-Card Risers
- Installing Expansion-Card Risers
- GPU Card Installation Guidelines
- Installing A GPU Card
- Removing A GPU Card
- SD vFlash Card
- Internal Dual SD Module
- Internal SD Card
- Integrated Storage Controller Card
- Network Daughter Card
- Processors
- Power Supplies
- System Battery
- Hard-Drive Backplane
- Control Panel Board
- System Board
- Troubleshooting Your System
- Safety First—For You And Your System
- Troubleshooting System Startup Failure
- Troubleshooting External Connections
- Troubleshooting The Video Subsystem
- Troubleshooting A USB Device
- Troubleshooting A Serial I/O Device
- Troubleshooting A NIC
- Troubleshooting A Wet System
- Troubleshooting A Damaged System
- Troubleshooting The System Battery
- Troubleshooting Power Supplies
- Troubleshooting Cooling Problems
- Troubleshooting Cooling Fans
- Troubleshooting System Memory
- Troubleshooting An Internal USB Key
- Troubleshooting An SD Card
- Troubleshooting An Optical Drive
- Troubleshooting A Tape Backup Unit
- Troubleshooting A Hard Drive
- Troubleshooting A Storage Controller
- Troubleshooting Expansion Cards
- Troubleshooting Processors
- Using System Diagnostics
- Jumpers And Connectors
- Technical Specifications
- System Messages
- Getting Help

System
Capacity (in
GB)
DIMM Size (in
GB)
Number of
DIMMs
DIMM Rank,
Organization, and
Frequency
DIMM Slot Population
160 8 20
2R, x4, 1333 MT/s A1, A2, A3, A4, A5, A6, A7, A8, A9,
A11
B1, B2, B3, B4, B5, B6, B7, B8, B9,
B11
16 and 8 12
2R, x4, 1333 MT/s,
2R, x4, 1600 MT/s
A1, A2, A3, A4, A5, A6,
B1, B2, B3, B4, B5, B6
NOTE
: 16 GB DIMMs must be
installed in slots numbered A1,
A2, A3, A4, B1, B2, B3, and B4
and 8 GB DIMMs must be
installed in slots A5, A6, B5,
and B6.
192 8 24
2R, x4, 1333 MT/s A1, A2, A3, A4, A5, A6, A7, A8, A9,
A10, A11, A12
B1, B2, B3, B4, B5, B6, B7, B8, B9,
B10, B11, B12
16 12
2R, x4, 1333 MT/s,
2R, x4, 1600 MT/s
A1, A2, A3, A4, A5, A6
B1, B2, B3, B4, B5, B6
256 16 16
2R, x4, 1333 MT/s,
2R, x4, 1600 MT/s,
A1, A2, A3, A4, A5, A6, A7, A8
B1, B2, B3, B4, B5, B6, B7, B8
384 16 24
2R, x4, 1333 MT/s A1, A2, A3, A4, A5, A6, A7, A8, A9,
A10, A11, A12
B1, B2, B3, B4, B5, B6, B7, B8, B9,
B10, B11, B12
32 12
4R, x4, 1333 MT/s A1, A2, A3, A4, A5, A6
B1, B2, B3, B4, B5, B6
512 32 16
4R, x4, 1066 MT/s
4R, x4, 1333 MT/s
A1, A2, A3, A4, A5, A6, A7, A8
B1, B2, B3, B4, B5, B6, B7, B8
768 32 24
LRDIMM, x4, 1333 MT/s A1, A2, A3, A4, A5, A6, A7, A8, A9,
A10, A11, A12
B1, B2, B3, B4, B5, B6, B7, B8, B9,
B10, B11, B12
1536 64 24
LRDIMM, x4, 1333 MT/s A1, A2, A3, A4, A5, A6, A7, A8, A9,
A10, A11, A12
B1, B2, B3, B4, B5, B6, B7, B8, B9,
B10, B11, B12
Removing Memory Modules
WARNING
: The memory modules are hot to the touch for some time after the system has been powered down.
Allow time for the memory modules to cool before handling them. Handle the memory modules by the card edges
and avoid touching the components or metallic contacts on the memory module.
46