Dell PowerEdge R840 Specifications
| Specification | Details |
|---|---|
| Form Factor | 2U Rack (four-socket) |
| Processors | Up to 4x Intel Xeon Scalable (up to 28 cores each) |
| Max Cores | 112 total (4x 28) |
| Memory Slots | 48x DDR4 RDIMM/LRDIMM (12 per CPU) |
| Max Memory | 6 TB with 128 GB LRDIMM modules |
| NVDIMM Support | Up to 12 NVDIMMs, 384 GB max |
| Drive Bays | Up to 24x 2.5" (up to 12 NVMe PCIe direct-attach) or 8x 2.5" + 2x 2.5" rear |
| Max Storage | 153 TB (24x NVMe) |
| RAID Controllers | S140 (SW), H330, H730P, H740P, HBA330, H840 (external) |
| BOSS Card | 2x M.2 SATA (120/240 GB) RAID1 |
| Management | iDRAC9, Redfish API, Quick Sync 2 |
| Power Supply | 750W Titanium, 750W/1100W/1600W/2000W/2400W Platinum, 1100W DC |
| Chassis Depth | 812 mm |
| Weight | 36.6 kg |
Dell R840 vs R740 vs R940 — Four-Socket vs Dual-Socket
| Feature | R840 (4S, 2U) | R740 (2S, 2U) | R940 (4S, 3U) |
|---|---|---|---|
| Sockets | 4 | 2 | 4 |
| Max Cores | 112 | 56 | 112 |
| DIMM Slots | 48 | 24 | 48 |
| Max RAM | 6 TB | 3 TB | 6 TB |
| Form Factor | 2U | 2U | 3U |
| Max Front Drives | 24x 2.5" | 16x 2.5" | 24x 2.5" |
| NVMe Direct-Attach | Up to 24 | Via PCIe only | Up to 12 |
| PCIe Slots | Limited | Up to 8 | Up to 13 |
| Rack Density | 21 per 42U | 21 per 42U | 14 per 42U |
Choose the R840 for four-socket performance in the densest form factor (2U) with up to 24 NVMe direct-attach drives. Choose the R940 when maximum PCIe expansion (13 slots) outweighs rack density. Choose the R740 when dual-socket performance with 56 cores and 3 TB RAM is sufficient.
Ideal Workloads for the Dell R840
SAP HANA and Oracle In-Memory Databases: 48 DIMM slots and 6 TB RAM capacity make the R840 a certified platform for SAP HANA and Oracle in-memory workloads that exceed dual-socket memory limits.
Large-Scale Virtualization Consolidation: 112 cores and 6 TB RAM provide the density to consolidate hundreds of VMs onto fewer physical servers, reducing licensing and management overhead.
Data Analytics and Business Intelligence: Four-socket compute with up to 24 NVMe direct-attach drives delivers the CPU + memory + storage IOPS combination that analytics platforms require.
Frequently Asked Questions
How many processors does the Dell R840 support?
Up to 4 Intel Xeon Scalable processors with up to 28 cores each, for a total of 112 cores and 224 threads in a 2U chassis.
What is the difference between the Dell R840 and R940?
Both are four-socket servers with 112 max cores and 6 TB RAM. The R840 is 2U with up to 24 NVMe direct-attach drives but limited PCIe slots. The R940 is 3U with up to 13 PCIe slots but lower rack density (14 per 42U vs 21). Choose the R840 for NVMe density and rack efficiency. Choose the R940 for maximum PCIe expansion.
What generation is the Dell R840?
The Dell PowerEdge R840 is a 14th Generation (14G) four-socket server using Intel Xeon Scalable processors.
How much does a refurbished Dell R840 cost?
Pricing depends on processor count, memory capacity, and storage configuration. Use the configurator on this page to request a quote. Enterasource builds every R840 to order with a 2-year warranty and free ground shipping to the lower 48 states.
Browse all Dell PowerEdge servers available at Enterasource.
