- Notes, Cautions, and Warnings
- 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 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 Cabled Hard Drive
- Installing A Cabled Hard Drive
- Removing A 2.5 Inch Hard Drive From A 3.5 Inch Hard-Drive Adapter
- Installing A 2.5 Inch Hard Drive Into A 3.5 Inch Hard-Drive Adapter
- Removing A Hard Drive Or A Hard-Drive Adapter From A Hard-Drive Carrier
- Installing A Hard Drive Or A Hard-Drive Adapter Into A Hard-Drive Carrier
- Optical Drive (Optional)
- Cooling Fans
- Internal USB Memory Key (Optional)
- Expansion Cards And Expansion-Card Risers
- iDRAC Ports Card (Optional)
- SD vFlash Card
- Internal Dual SD Module
- Internal SD Card
- Integrated Storage Controller Card
- Processors
- Power Supplies
- System Battery
- Hard-Drive Backplane
- Control Panel Assembly
- VGA Module
- Power Distribution Board Shroud
- Power Distribution Board
- System Board
- Troubleshooting
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
Dell PowerEdge R420 Systems Owner's Manual
Advanced ECC (Lockstep)
Advanced ECC mode extends SDDC from x4 DRAM based DIMMs to both x4 and x8 DRAMs. This protects against single DRAM chip failures during normal operation.
Memory installation guidelines:
- Memory sockets A1, A4, B1, and B4 are disabled and do not supported Advanced ECC mode.
- DIMMs must be installed in matched pairs — DIMMs installed in memory sockets (A2, B2) must match DIMMs installed in memory sockets (A3, B3) and DIMMs installed in memory sockets (A5, B5) must match DIMMs installed in memory sockets (A6, B6).
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