Quick Specs Form Factor: 3U rack server Processor | Max: 28 Cores Up to 4x 4th Gen Intel Xeon Scalable Memory | Max: 6TB 48 DDR4 RDIMM, LRDIMM 2933MhzUp to 12 NVDIMM, 384GB MaxUp to 24 Intel® Optane™ DC persistent memory DCPMM, max 12.28TB(15.36TB max with DCPMM and LDRIMM)Supports registered ECC DDR4 DIMMs only Storage | Max: 184.32TB Up to 8 x 2.5” SAS/SATA (HDD/SSD)Up to 24 x 2.5” SAS/SATA (HDD/SSD)with up to 8 NVMe PCIe SSD Rear Storage: None Boot Options: BOSSUSBIDSDM (Virtualized Platforms only) PCIe Slots: Up to 13 x Gen3 slots, (3 x8 + 10 x16) Remote management: iDRAC9 with Lifecycle Controller rNDC LOM: 4x 1GbE, 4x 10GbE, 2x 10GbE+2x 1GbE, or 2x 25GbE RAID controllers: (Supports Dual Controllers) S140 (SW RAID | NVMe, M.2 SATA)PERC H330, H730P, H740P, HBA330, H840, 12 Gbps HBA Other Versions Dell PowerEdge R920 Dell PowerEdge R930 Dell PowerEdge R940 Dell PowerEdge R940xa Dell PowerEdge R960 (Click to View) Ideal for: Database High-Performance Computing (HPC) Retail Servers Virtualization The Dell PowerEdge R940 is built to power mission-critical applications and real-time decision-making, offering scalable four-socket performance and support for up to 12 NVMe drives in a compact 3U chassis. Reaching the full four-socket configuration requires installing the Processor Expansion Module (PEM), which stacks the processors and adds 24 additional DIMM slots. Drive Configuration Options Dell PowerEdge R940 Drive Configurations are: Up to (8) 2.5 inch (SAS, SATA or Nearline SAS) Up to (24) 2.5 inch (SAS, SATA or Nearline SAS) Up to (20) SAS + (4) NVMe SAS/SATA Up to (16) SAS + (8) NVMe SAS/SATA Cooling Configurations The Dell PowerEdge R940 features 8 hot-swap fans with full N+1 redundancy, allowing continuous operation even if one fan fails. Each fan can be replaced without powering down the system, and all 8 fans sit within a fan cage that lowers into the fan tray. An active power management feature on this system governs fan speed and thermal settings, helping reduce fan usage and overall system power consumption based on the operating environment. Memory Options Each CPU includes 12 memory DIMM slots, totaling 48 DIMMs across the system, split across six channels with 2 DIMMs per channel. Best performance comes from populating all channels evenly per CPU — either 6 or 12 DIMMs total. RDIMM/LRDIMM(Registered DIMM)(Load Reduced DIMM) RDIMMs offer higher-capacity options along with advanced RAS features, making them the most commonly used DIMM type with a solid balance of frequency, capacity, and rank structure choices. LRDIMMs push memory capacity beyond RDIMM limits, though at higher power draw, using a buffer to reduce loading to a single load across all DDR signals for greater density. RDIMMs and LRDIMMs must not be mixed. PMem (Intel Optane persistent memory) PMem is available in 128GB, 256GB, and 512GB capacities, with App Direct Mode unlocking added performance and persistence for supported applications. It pairs with RDIMMs or LRDIMMs, supports up to 6 modules per CPU, and requires no battery for its persistent memory functionality. 2400 W PSU is required. NVDIMM-N (Non-Volatile DIMM) This persistent memory solution combines NAND and DRAM to retain data through power loss, system crashes, or normal shutdowns, requiring a battery to handle AC loss conditions. It works with RDIMMs in dual-processor configurations with a minimum of 12x RDIMMs, and cannot be mixed with LRDIMMs. Given the range of supported configurations, the installation guide should be consulted for full rules and restrictions. Maximum of 12 NVDIMM-Ns can be installed in a system. DIMM Capacity (GB) DIMM Type DIMM Speed (MT/s) Ranks per DIMM Data Width 8 GB RDIMM 2666 1 x8 16 GB RDIMM 2933/2666 2 x8 32 GB RDIMM 2933/2666 2 x4 64 GB RDIMM 2933/2666 2 x4 64 GB LRDIMM 2666 4 x4 128 GB LRDIMM (3DS) 2666 8 x4 128 GB LRDIMM (DDP) 2933 4 x4 16 GB NVDIMM-N 2933/2666 -NA- -NA- 128 GB PMem 2666 -NA- -NA- 256 GB PMem 2666 -NA- -NA- 512 GB PMem 2666 -NA- -NA- PCIe Configurations Systems with 2 socket processors (without Processor Expansion Module) support up to 7 PCIe Gen3 expansion slots. Systems with 4 socket processors (with Processor Expansion Module) supports up to 13 PCIe Gen3 expansion slots. Physical location Slot number Form factor Controlling CPU Slot electrical bandwidth/Physical connector Power Length Baseboard 1 Full height CPU1 PCIe GEN3 x8 (x16 connector) 25 W half length Baseboard 2 Full height CPU1 PCIe GEN3 x16 (x16 connector) 75 W half length Baseboard 3 Full height CPU1 PCIe GEN3 x16 (x16 connector) 75 W half length Baseboard 4 Full height CPU2 PCIe GEN3 x16 (x16 connector) 75 W half length Baseboard 5 Full height CPU2 PCIe GEN3 x8 (x16 connector) 25 W half length Baseboard 6 Full height CPU2 PCIe GEN3 x8 (x16 connector) 25 W half length Baseboard 7 Full height CPU2 PCIe GEN3 x16 (x16 connector) 75 W half length Riser 2 on PEM for 4 socket configuration 8 Full height CPU3 PCIe GEN3 x16 (x16 connector) 75 W 10.5" (~3/4 length) Riser 2 on PEM for 4 socket configuration 9 Full height CPU3 PCIe GEN3 x16 (x16 connector) 75 W half length Riser 2 on PEM for 4 socket configuration 10 Full height CPU3 PCIe GEN3 x16 (x16 connector) 25 W half length Riser 3 on PEM for 4 socket configuration 11 Full height CPU4 PCIe GEN3 x16 (x16 connector) 75 W 10.5" (~3/4 length) Riser 3 on PEM for 4 socket configuration 12 Full height CPU4 PCIe GEN3 x16 (x16 connector) 25 W half length Riser 3 on PEM for 4 socket configuration 13 Full height CPU4 PCIe GEN3 x16 (x16 connector) 25 W half length Networking Options The PowerEdge R940 delivers balanced, scalable I/O through integrated PCIe 3.0 expansion slots, while Dell network adapters and daughtercards allow fabric selection without consuming PCIe slots — with PCIe slot 2 dedicated specifically to the rNDC. Network daughter card options4x 1GbE, 4x 10GbE, 2x 10GbE+2x 1GbE, or 2x 25GbE Storage Controller Configurations The PowerEdge R940 supports full-height PERC adapters exclusively in slot 1 (primary) and slot 6 (secondary), with no support for mini PERC form factors. Performance level Controller and description Entry S140 (NVMe, M.2 SATA)SW RAID SATA Value H330+, 12Gb SAS HBA (External)Memory: Nonex8 12 Gb SASx8 PCIe 3.0 Premium performance H740P, H840Memory: 4/8GB, NV 72-bit Boot Options Dell's Gen14 lineup includes a boot option called BOSS (Boot Optimized Storage Subsystem) — a hardware RAID controller with a limited feature set designed specifically for booting a full OS drive. It presents M.2 SATA-only SSDs as either non-RAID disks or a single RAID 1 volume. The Dell PowerEdge R940 rack server also includes an internal USB option and supports the IDSDM for booting a hypervisor OS in virtualization workloads. BOSS IDSDM Internal USB Power & Dimensions Power 2 Hot plug power supplies with full redundancy option.Titanium: 1600 W HLAC, 2600 W HLACPlatinum 1100W, 1100W 380VDC, 1600W, 2000W, 2400WGold 1100W-48VDC Dimensions Height: 130.3mm (5.13”) Width: 434mm (17.08”) Depth: 784.2mm (30.8”) Weight: 49.9kg (110lbs.) *Dimensions do not include bezel
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