Dell PowerEdge R820
The PowerEdge R820 integrates dense four-socket Intel Xeon E5-4600 compute into a space-efficient 2U chassis. With 48 DDR3 memory slots supporting up to 1.5TB of RAM, it was widely adopted for memory-intensive enterprise virtualization, consolidation, and high-concurrency relational databases.
Also written as: PowerEdge R820, Dell R820, R820 4-Socket Server
Specifications
| Brand | Dell |
|---|---|
| Family | PowerEdge R |
| Form factor | 2U rack |
| Released | Jun 2012 |
| End of sale | Jun 2016 |
| End of support | Jun 2021 |
| Cpu sockets | 4 |
| Cpu platform | Intel Xeon E5-4600 and E5-4600 v2 series processors |
| Memory slots | 48 |
| Memory type | DDR3 ECC RDIMM/LRDIMM up to 1866 MT/s |
| Drive bays | Up to 16x 2.5in SAS/SATA drives |
| Pcie slots | Up to 7x PCIe Gen3 slots |
| Power supply | Dual hot-plug redundant PSUs (750W, 1100W, 1600W) |
Generations
- Next generation: Dell PowerEdge R830
Works together
How the Dell PowerEdge R820 connects to servers, storage and the network: 4 ways, with the parts and products on each path.
Fibre Channel SAN
Match the speed: 16Gb and 32Gb FC HBAs, switches and array ports work together, and each generation also runs one or two speeds below its own (a 32Gb port runs at 16Gb and 8Gb).
Adapters for the server (check the fit list)
540-BBUU Dell Emulex LPe31002 Dual Port 16Gb Fibre Channel Host Bus Adapter
540-BBUV Dell QLogic 2692 Dual Port 16Gb Fibre Channel Host Bus Adapter
540-BCMS Dell QLogic 2770 Single Port 32Gb Fibre Channel PCIe Adapter
540-BCMT Dell QLogic 2772 Dual Port 32Gb Fibre Channel PCIe Adapter
Switches
Dell Connectrix MDS-9710 14U director chassis
Dell Connectrix MDS-9706 9U director chassis
Dell Connectrix MDS-9148S 1U switch
Dell Connectrix MP-7840B 2U switch
Storage
Dell PowerVault MD3660F 4U rack
Dell PowerProtect DD Data Domain DD2500 2U controller + shelves
Dell PowerProtect DD Data Domain DD4200 2U controller + shelves
Dell PowerProtect DD Data Domain DD4500 2U controller + shelves
Dell PowerProtect DD Data Domain DD7200 2U controller + shelves
Dell PowerVault MD3600F 2U rack
Optics
iSCSI and NVMe/TCP over Ethernet
Keep the speed the same at all three points: a 25GbE server, a 25GbE switch port and a 25GbE array port. Mixed speeds work but the slowest link sets the pace.
Adapters for the server (check the fit list)
540-BBGN Dell Broadcom 57412 Dual Port 10GbE SFP+ PCIe Adapter
540-BBGO Dell Broadcom 57416 Dual Port 10GBASE-T RJ45 PCIe Adapter
540-BBGP Dell Broadcom 57416 Dual Port 10GBASE-T RJ45 OCP 3.0 Adapter
540-BBGY Dell Broadcom 57414 Dual Port 10/25GbE SFP28 PCIe Low Profile Network Adapter
Switches
Dell PowerSwitch N2024 1U switch
Dell PowerSwitch N2024P 1U switch
Dell PowerSwitch N2048 1U switch
Dell PowerSwitch N2048P 1U switch
Storage
- Dell PowerProtect DD Data Domain DD2500 2U controller + shelves
- Dell PowerProtect DD Data Domain DD4200 2U controller + shelves
- Dell PowerProtect DD Data Domain DD4500 2U controller + shelves
- Dell PowerProtect DD Data Domain DD7200 2U controller + shelves
Dell PowerVault MD3600i 2U rack
Dell PowerVault MD3620i 2U rack
Optics
Direct-attached SAS
12Gb SAS uses Mini-SAS HD (SFF-8644) connectors; older 6Gb gear uses Mini-SAS (SFF-8088). Adapter cables exist, but the link runs at the slower speed.
Adapters for the server (check the fit list)
405-AANT Dell 12Gbps SAS HBA Dual Port External PCIe Controller
405-AASU Dell HBA355e External SAS 12Gb/s Host Bus Adapter
HBA465E Dell HBA465e External Host Bus Adapter
Storage
Dell PowerVault MD1200 2U rack
Dell PowerVault MD1220 2U rack
Dell PowerVault MD1400 2U rack
Dell PowerVault MD1420 2U rack
Dell PowerVault MD3200 2U rack
Dell PowerVault MD3220 2U rack
File storage (NFS and SMB)
Front-end ports face the clients; back-end ports (on scale-out systems) connect the nodes to each other and need their own switch pair.
Adapters for the server (check the fit list)
- 540-BBGN Dell Broadcom 57412 Dual Port 10GbE SFP+ PCIe Adapter
- 540-BBGO Dell Broadcom 57416 Dual Port 10GBASE-T RJ45 PCIe Adapter
- 540-BBGP Dell Broadcom 57416 Dual Port 10GBASE-T RJ45 OCP 3.0 Adapter
- 540-BBGY Dell Broadcom 57414 Dual Port 10/25GbE SFP28 PCIe Low Profile Network Adapter
Switches
- Dell PowerSwitch N2024 1U switch
- Dell PowerSwitch N2024P 1U switch
- Dell PowerSwitch N2048 1U switch
- Dell PowerSwitch N2048P 1U switch
Storage
Dell PowerStore 7000T 2U rack
Dell Unity 300 2U rack
Dell Unity 300F 2U rack
Dell Unity 400 2U rack
Dell Unity 400F 2U rack
Dell Unity 500 2U rack
Optics
Plan and size it
- Draw this setup in the topology planner mrplanb.com
- Add up rack power and space rack-density.com
- Virtualization storage Ledger: scored storage platforms mrplanb.com
- SAN transport and NVMe over FC for backup mrplanb.com
- Dell E-Lab Navigator (Dell interoperability) dell.com
Check compatibility with Dell
Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that Dell has tested with the Dell PowerEdge R820.
- Compatibility Dell E-Lab Navigator (storage and SAN interoperability) (free vendor sign-in)
- Support Dell Support: drivers, manuals and service tag lookup
Equivalent models from other brands
FAQ
What processors are used in the dense 4-socket PowerEdge R820?
The R820 runs up to four Intel Xeon E5-4600 or E5-4600 v2 processors, packing up to 48 physical cores into 2U of rack space.
How much RAM does the PowerEdge R820 support?
With 48 DDR3 DIMM slots, the R820 supports up to 1.5TB of RAM using 32GB LRDIMMs, offering immense memory density for its era.
Buying or selling R820?
New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.
Sources
- Dell PowerEdge R820 Support Overview, checked 2026-10-27
- Dell PowerEdge R820 Technical Documentation, checked 2026-10-27