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Home / 13 PCIe Slots / Dell PowerEdge R940 Rack Server | Configurable

Current Configuration

(List below serves as quick links to each section)

Server Chassis

Processors

Bezel

Memory for 1st Gen Intel

Memory for 2nd Gen Intel

HDD 2.5" Drives

SSD (2.5") Drives

SSD U.2 NVMe Drives

Network Daughter Card (rNDC) LOM

RAID Controllers

Boot Optimized Storage Subsystem (BOSS-S1):

Internal Dual SD Module (IDSDM)

Rail Kits

Trusted Platform Module

iDRAC9 Remote Options

Power Supplies

ECS Warranty

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Dell PowerEdge R940 Rack Server | Configurable

Dell

| CTO Servers

 

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Server Chassis

Processors

Supports (2) or (4) processors configuration
With no Processor expansion module (PEM) being installed. It's a 2-Socket 24 Dimm Configuration.
With the Processor expansion module (PEM) being installed it becomes a 4-socket 48 DIMM configuration.
PEM will be automatically installed when 4 CPUs are selected.

Intel Xeon Scalable

Intel 2nd Gen Xeon Scalable

Bezel (Optional)

Optional LCD security bezel

Memory for 1st Gen Intel (Optional)

12 DIMMs per processor (up to 48 DIMMs in a 4-processor configuration)
RDIMMs and LRDIMMs must not be mixed.
NVDIMMs and LRDIMMs must not be mixed.
NVDIMMs and RDIMMs can be mixed.
Maximum of 12 NVDIMM-Ns can be installed in a system.
NVDIMM-Ns or RDIMMs must not be mixed with LRDIMMs.
Maximum of 24 PMem's can be installed in a system 4-Socket Configuration.
PMem is supported on systems with 1600W and 2400W PSU configuration.
PMem can be mixed with RDIMM, LRDIMM, and 3DS LRDIMM.
Mixing of PMem operating modes (App Direct, Memory Mode) is not supported.
For more Memory Rules please refer to the manuals below.

Memory for 2nd Gen Intel (Optional)

12 DIMMs per processor (up to 48 DIMMs in a 4-processor configuration)
RDIMMs and LRDIMMs must not be mixed.
NVDIMMs and LRDIMMs must not be mixed.
NVDIMMs and RDIMMs can be mixed.
Maximum of 12 NVDIMM-Ns can be installed in a system.
NVDIMM-Ns or RDIMMs must not be mixed with LRDIMMs.
Maximum of 24 PMem's can be installed in a system 4-Socket Configuration.
PMem is supported on systems with 1600W and 2400W PSU configuration.
PMem can be mixed with RDIMM, LRDIMM, and 3DS LRDIMM.
Mixing of PMem operating modes (App Direct, Memory Mode) is not supported.
For more Memory Rules please refer to the manuals below.

HDD 2.5" Drives (Optional)

Supports up to 24 Drives

SSD (2.5") Drives (Optional)

Supports up to (8), (24), (20+4 NVMe), or (16+8 NVMe) Front Bay Drives based on the configuration desired

SSD U.2 NVMe Drives (Optional)

Supports up to (20+4 NVMe), (16+8 NVMe) Front Bay Drives based on the configuration desired

Network Daughter Card (rNDC) LOM (Optional)

RAID Controllers (Optional)

Embedded S140 software RAID installed by default
The SAS Expander board is only supported on the 24 Bay Backplane
The system supports Dual PERC's

Boot Optimized Storage Subsystem (BOSS-S1): (Optional)

Internal Dual SD Module (IDSDM) (Optional)

Rail Kits (Optional)

Trusted Platform Module (Optional)

iDRAC9 Remote Options (Optional)

Default iDRAC9 Express

Power Supplies

Supports up to (2) PSU's

ECS Warranty

Helpful Tip: Once desired configuration is selected click "Add to Cart".
From the cart page you can submit a submit a quote request for best pricing

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 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

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:

BOSS
USB
IDSDM (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

(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 options
4x 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: None
x8 12 Gb SAS
x8 PCIe 3.0
Premium performance H740P, H840
Memory: 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.

Image of the BOSS Adapter for the R940 Dell Rack Server BOSS
Image of the IDSDM for the R940 Dell Rack Server IDSDM
Image of the Internal USB for the R940 Dell Rack Server Internal USB
Power & Dimensions
Power

2 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

Dimensions
  • Height: 130.3mm (5.13”)
  • Width: 434mm (17.08”)
  • Depth: 784.2mm (30.8”)
  • Weight: 49.9kg (110lbs.)
  • *Dimensions do not include bezel

Current Configuration

(List below serves as quick links to each section)

Server Chassis

Processors

Bezel

Memory for 1st Gen Intel

Memory for 2nd Gen Intel

HDD 2.5" Drives

SSD (2.5") Drives

SSD U.2 NVMe Drives

Network Daughter Card (rNDC) LOM

RAID Controllers

Boot Optimized Storage Subsystem (BOSS-S1):

Internal Dual SD Module (IDSDM)

Rail Kits

Trusted Platform Module

iDRAC9 Remote Options

Power Supplies

ECS Warranty

The request has been sent.
Thank you.

Price as Configured:
$0

Error Submitting Cart. Please get in touch with us for support.

Please select all the mandatory items in the configuration list before submitting the cart.

One or more items in your cart has no price. This will be submitted as a "Request for a Quote".

Base Standard Capabilities

FeaturesTechnical specification
ProcessorUp to four 2nd Generation Intel® Xeon® Scalable processors, up to 28 cores each
Memory48 DDR4 DIMM slots, Supports RDIMM /LRDIMM, up to 2933MT/s, 6TB max
Up to 12 NVDIMM, 384GB Max
Up to 24 Intel® Optane™ DC persistent memory PMem, max 12.28TB, (15.36TB max with PMem and LRDIMM)
Supports registered ECC DDR4 DIMMs only
Storage controllersInternal Controllers: PERC H330, H730P, H740P, HBA330
External Controllers: H840, 12 Gbps SAS HBA
Software RAID:S140
Boot Optimized Storage Subsystem (BOSS):HWRAID 2 x M.2 SSDs 240GB, 480GB
Internal Dual SD Module
Drive baysFront bays:
  • Up to 24 x 2.5” SAS/SATA (HDD/SSD) with up to 12 NVMe PCIe SSD, max 184.32TB
Power suppliesGold:1100W - 48VDC
Platinum 1100W, 1600W, 2000W, 2400W
Hot plug power supplies with full redundancy option
8 hot plugs fans with full redundancy
DimensionsForm factor: Rack (3U)
Height: 130.3mm (5.13”)
Width: 434mm (17.08”)
Depth: 784.2mm (30.8”)
Weight: 49.9kg (110lbs.)
*Dimensions do not include bezel
Embedded managementIPMI 2.0 compliant
iDRAC9,
iDRAC Direct,
iDRAC RESTful with Redfish
Quick Sync 2 wireless module (optional)
BezelOptional LCD bezel or security bezel
OpenManage SoftwareOpenManage Enterprise
OpenManage Mobile
OpenManage Power Center
Integrations and connectionsIntegrations:
Microsoft System Center
VMware vCenter
BMC Truesight
Red Hat Ansible Modules		Connections:
IBM Tivoli® Netcool/OMNIbus
Micro Focus Operations Manager i (OMi)
Nagios® Core
Nagios® XI
SecurityTPM 1.2/2.0 optional
Cryptographically signed firmware
Secure Root of Trust
Secure Boot
Secure Erase
System Lockdown (requires iDRAC Enterprise or Datacenter)
I/O & PortsNetwork daughter card options:
  • 4 x 1GbE
  • 4 x 10GbE
  • 2 x 10GbE + 2 x 1GbE
  • 2 x 25GbE
Front Ports:
  • 2 x USB 3.0
  • 1 x VGA
  • 1 x Dedicated iDRAC Direct USB
Rear Ports:
  • 1 x Dedicated iDRAC network port
  • 1 x Serial
  • 2 x USB 3.0
  • 1 x VGA
Video card:
  • 2 x VGA
PCIe:
  • Up to 13 x Gen3 slots, (3 x8 + 10 x16)
Supported operating systemsCanonical® Ubuntu® LTS
Citrix® Hypervisor
Microsoft Windows Server® LTSC with Hyper-V
Oracle® Linux
Red Hat® Enterprise Linux
SUSE® Linux Enterprise Server
VMware® ESXi

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