




(List below serves as quick links to each section)
3U rack server
Processor | Max: 28 CoresUp to 4x 4th Gen Intel Xeon Scalable
Memory | Max: 6TB48 DDR4 RDIMM, LRDIMM 2933Mhz
Up to 12 NVDIMM, 384GB Max
Up to 24 Intel® Optane™ DC persistent memory DCPMM, max 12.28TB
(15.36TB max with DCPMM and LDRIMM)
Supports registered ECC DDR4 DIMMs only
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
None
Boot Options:BOSS
USB
IDSDM (Virtualized Platforms only)
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
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The PowerEdge R940 is designed to power your mission critical applications and real-time decisions. With four sockets and up to 12 NMVe drives, the R940 provides scalable performance in just 3U. You can accomplish the 4 Socket system when you install the Processor Expansion Module (PEM). This PEM will stack the processors and supply an extra 24 DIMMs.
Breathtaking performance for mission-critical workloadsThe scalable business architecture of the Dell EMC PowerEdge R940 can deliver the most mission critical workloads. With automatic workload tuning for many workloads, configuration is quick. Combined with up to 15.36TB of memory and 13 PCIe Gen 3 slots, the R940 has all the resources to maximize application performance and scale for future demands.
The Dell EMC OpenManage portfolio helps deliver peak efficiency for PowerEdge servers, delivering intelligent, automated management of routine tasks. Combined with unique agent-free management capabilities, the PowerEdge R940 is simply managed, freeing up time for high profile projects.
The R940 is the foundation to transform your data center with modern applications for real-time data and analytics. Its massive resource footprint optimizes application performance and scales to meet your organization’s demands.
Every PowerEdge server is designed as part of a cyber resilient architecture, integrating security into the full server life cycle. The R940 leverages new security features built-into every new PowerEdge server strengthening protection so you can reliably and securely deliver accurate data to your customers no matter where they are. By considering each aspect of system security, from design to retirement, Dell EMC ensures trust and delivers a worry-free, secure infrastructure without compromise.

The Dell PowerEdge R940 has 8 hot-swap fans with full redundancy. The R940 allows N+1 fan redundancy, allowing continuous operation with one fan failure in the system. Each Fan can be replaced without turning the system off. All 8 fans are placed in a fan cage that is lowered into the fan tray.
This system has an Active power management feature. This feature controls the Thermal control of the fan speed and optimizes the thermal settings for your environment to reduce fan consumption and lower system power consumption.

Each CPU has 12 memory DIMM slots for a total of 48 DIMMS. Those DIMMs are organized into six different channels so there are 2 DIMMs per channel. For best performance, all memory channels should be populated with the same number of DIMMs, either 6 or 12 DIMMs per CPU.

RDIMM/LRDIMM
(Registered DIMM)
(Load Reduced DIMM)
RDIMM - Provides for higher capacity options and advanced RAS features. It is the most commonly used DIMM type, and offers the best mix of frequency, capacity, and rank structure choices.
LRDIMM - Provides maximum capacity beyond that of an RDIMM but at a higher power consumption. Uses a buffer to reduce memory loading to a single load on all DDR signals, allowing for greater density.
RDIMMs and LRDIMMs must not be mixed.
PMem
(Intel Optane persistent memory)
PMem comes in three different memory sizes, 128 GB, 256 GB, and 512 GB. Unlock more performance and persistency when using an application that supports App Direct Mode. PMem is used with RDIMMs or LRDIMMs, and a maximum number of 6 PMems can be used per CPU. This persistent memory technology does not require a battery.
2400 W PSU is required.
NVDIMM-N
(Non-Volatile DIMM)
Provides a persistent memory solution with NAND and DRAM that maintains data in power loss, system crash, or normal shutdown. This solution requires a battery as a power source for an AC loss condition. It can be used with RDIMMs. Supported configurations have dual processors and a minimum of 12x RDIMMs. Can't be mixed with LRDIMMs. There are many configurations to read up on. Please look at the installation guide for all the 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- |
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 |
The PowerEdge R940 offer balanced, scalable I/O capabilities including integrated PCIe 3.0 expansion slots. Dell network adapters and daughtercards let you choose the right network fabric without using up valuable PCI slots. PCIe Slot 2 is the dedicated slot for the rNDC.
Network daughter card options
4x 1GbE,
4x 10GbE,
2x 10GbE+2x 1GbE,
or 2x 25GbE

The PowerEdge R940 supports full height PERC adapter form factor only in slot 1 (for primary) and slot 6 (for secondary), and does not support 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: None x8 12 Gb SAS x8 PCIe 3.0 |
| Premium performance | H740P, H840 Memory: 4/8GB, NV 72-bit |
The Dell Gen14 has a Boot option called BOSS. Boot Optimized Storage Subsystem (BOSS).The Hardware RAID BOSS is a RAID controller with a limited feature set for the purpose of boot up to a full OS drive. The BOSS RAID controller presents M.2 SATA-only Solid State drives (SSD) as either Non-RAID disks or a single RAID1 volume configuration.
The Dell PowerEdge R940 rack server also has an Internal USB and supports the IDSDM for booting the Hypervisor OS for Virtualization workloads.
BOSS
IDSDM
Internal USB2 Hot plug power supplies with full redundancy option.
Titanium: 1600 W HLAC, 2600 W HLAC
Platinum 1100W, 1100W 380VDC, 1600W, 2000W, 2400W
Gold 1100W-48VDC
(List below serves as quick links to each section)