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Dell PowerEdge DDR4 Memory Modules: Prices, Compatibility, Upgrade Options, RDIMM/LRDIMM Part Numbers

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Upgrading or replacing DDR4 memory modules in Dell PowerEdge servers is one of the most common tasks for anyone maintaining Dell 13th, 14th, or 15th Generation servers.


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Whether you operate virtualization clusters, databases, VMs, HCI nodes, or general workloads, choosing the right Dell PowerEdge DDR4 memory module (RDIMM or LRDIMM) is essential for performance and stability.


Dell PowerEdge DDR4 server memory modules including RDIMM and LRDIMM used in 13th, 14th, and 15th Generation PowerEdge servers.-server-parts.eu-refurbished-used


What Is Dell PowerEdge DDR4 Memory?


Dell PowerEdge DDR4 memory is enterprise-grade ECC server memory validated for specific Dell platforms.


It provides:


  • ECC error correction

  • Lower failure rates

  • Integration with iDRAC for diagnostics

  • Consistent performance under mixed workloads

  • Validation for specific PowerEdge models


It is not the same as desktop DDR4.Only ECC RDIMM and ECC LRDIMM modules are supported in Dell PowerEdge servers.



Dell DDR4 RDIMM vs. LRDIMM for PowerEdge Servers


Both memory types are common in Dell PowerEdge DDR4 environments, but they serve different needs.


Dell PowerEdge RDIMM (Registered DIMM) Memory

  • Best choice for general workloads

  • Lower latency

  • Typically 8GB–64GB per module

  • Most cost-effective

  • Common in Dell PowerEdge R630, R730, R640, R740, R440, R540



Dell PowerEdge LRDIMM (Load-Reduced DIMM) Memory

  • Designed for higher capacity per slot

  • Typically 64GB–128GB (and some 256GB) modules

  • Ideal for virtualization, HCI, SAP, databases

  • Slightly higher latency

  • Required if you want maximum memory per CPU


Critical rule: RDIMM and LRDIMM cannot be mixed in the same system. The server will not boot if mixed.



Dell PowerEdge DDR4 Memory Speeds and Generations


Different PowerEdge generations support different DDR4 speeds:

Generation

Supported DDR4 Speeds

CPU Platform

Dell PowerEdge 13th Gen (e.g. R630, R730)

1866 / 2133 MT/s

Intel Xeon E5 v3 / v4

Dell PowerEdge 14th Gen (e.g. R640, R740, R740xd)

2133 / 2400 / 2666 MT/s

Intel Xeon Scalable Gen1

Dell PowerEdge 15th Gen (e.g. R650, R750)

2666 / 2933 / 3200 MT/s

Intel Xeon Scalable Gen2-based line


Speed rules:

  • Final speed = the slowest DIMM installed

  • More DIMMs per channel → lower effective speed

  • CPU model determines maximum possible speed


These rules apply to all Dell PowerEdge DDR4 memory modules.



Most Popular Dell PowerEdge DDR4 Memory Modules


16GB RDIMM – Dell PowerEdge DDR4 Memory

  • SNP1R8CRC/16G / 1R8CR / A7945660 – 16GB DDR4-2133 RDIMM2Rx4, PC4-17000, ECC RDIMM used in many 13th Gen servers.

  • 370-AFBK / SNPHNDJ7DG/16G – 16GB DDR4-2400 RDIMM2Rx8 or 2Rx4, PC4-19200, ECC RDIMM for PowerEdge servers.

  • SNPPWR5TC/16G / SNPVM51CC/16G – 16GB DDR4-2666 RDIMM2Rx8, PC4-21300, ECC RDIMM for newer 14th/15th Gen platforms.



32GB RDIMM – Dell PowerEdge DDR4 Memory

  • SNPPR5D1C/32G – 32GB DDR4-2133 RDIMM2Rx4, PC4-17000, ECC RDIMM widely used in R230, R330, R430, R530, R630, R730, etc.

  • SNPCPC7GC/32G – 32GB DDR4-2400 RDIMM2Rx4, PC4-19200, ECC RDIMM; Dell PN often mapped to 4M70C on the module label.

  • A9781929 / SNPTN78YC/32G – 32GB DDR4-2666 RDIMM2Rx4, PC4-21300, ECC RDIMM certified for R640, R740, R740xd, R940, etc.



64GB LRDIMM – Dell PowerEdge DDR4 Memory

  • SNP03VMYC/64G / A8451131 / A8718891 / 003VMY – 64GB DDR4-2133 LRDIMM4Rx4, PC4-17000, ECC LRDIMM for 13th Gen PowerEdge servers.

  • SNP29GM8C/64G / A8711890 / 29GM8 – 64GB DDR4-2400 LRDIMM4Rx4, PC4-19200, ECC LRDIMM; very common for 13th and 14th Gen platforms.

  • SNP4JMGMC/64G / A9781930 / 4JMGM – 64GB DDR4-2666 LRDIMM4Rx4, PC4-21300, ECC LRDIMM used in R640, R740, R740xd, etc.



128GB LRDIMM – Dell PowerEdge DDR4 Memory

  • SNPXNJHYC/128G / A9031094 – 128GB DDR4-2400 LRDIMM8Rx4 (octa-rank) PC4-19200 LRDIMM for high-capacity 13th/14th Gen servers.

  • SNP917VKC/128G / A9781931 – 128GB DDR4-2666 LRDIMM8Rx4 PC4-21300 LRDIMM for 14th/15th Gen PowerEdge and higher-end workloads.


These are the core Dell PowerEdge DDR4 memory modules used in Dell PowerEdge R630, R730, R640, R740, R740xd, R440, R540, T440, T640, and similar servers.



Compatibility Rules for Dell PowerEdge DDR4 Memory


The following rules avoid almost all memory-related issues in Dell PowerEdge servers:


  • RDIMM and LRDIMM cannot be mixed

    • Mixing results in no POST.


  • Both CPUs must use the same DIMM layout

    • If CPU1 has 2 DIMMs per channel, CPU2 must also have 2 per channel.


  • Mixed speeds run at the slowest speed

    • Example: 2666 + 2400 → everything runs at 2400 MT/s.


  • Rank affects speed and capacity

    • 1Rx8 → rare, lower density

    • 2Rx8 / 2Rx4 → common 16GB / 32GB

    • 4Rx4 / 8Rx4 → used in 64GB / 128GB LRDIMM


  • Maximum memory depends on your CPU

    • Intel Xeon E5 (13th Gen) → typically up to 768GB per server

    • Xeon Scalable Gen1 → up to 1.5TB per CPU (with LRDIMM)

    • Xeon Scalable Gen2 → up to 2TB per CPU in some configs


  • DIMM population order matters

    • Fill one DIMM per channel first, then a second. Wrong population can reduce bandwidth or force an “unbalanced” mode.


  • Firmware must be up to date

    • Old BIOS/iDRAC can cause “invalid DIMM configuration”, incorrect speed detection, or POST failures after upgrades.


  • Mixed densities are allowed (RDIMM only)

    • You can mix 16GB and 32GB RDIMMs as long as channels remain balanced. Mixing densities for LRDIMM is not recommended.


  • High-capacity LRDIMMs need good airflow

    • 64GB and 128GB LRDIMMs run hotter and may increase fan speeds.



Dell PowerEdge Servers Using DDR4 Memory


Dell PowerEdge 13th Generation (DDR4-2133)

  • Dell PowerEdge R630

  • Dell PowerEdge R730 / R730xd

  • Dell PowerEdge T630



Dell PowerEdge 14th Generation (DDR4-2400 / 2666)

  • Dell PowerEdge R640

  • Dell PowerEdge R740 / R740xd / R740xd2

  • Dell PowerEdge R440 / R540

  • Dell PowerEdge T640



Dell PowerEdge 15th Generation (DDR4-2933 / 3200)

  • Dell PowerEdge R650

  • Dell PowerEdge R750


(Dell PowerEdge 16th Gen moves to DDR5 and is outside the DDR4 scope.)


Typical Dell PowerEdge DDR4 Memory Market Prices (EU Refurbished)


Approximate price ranges:

Module

Typical Price (EUR)

Dell 16GB RDIMM

25–40 EUR

Dell 32GB RDIMM

40–70 EUR

Dell 64GB LRDIMM

70–140 EUR

Dell 128GB LRDIMM

180–350 EUR

Actual pricing depends on part number (especially rank and speed), vendor stock, and current supply/demand.



Why Enterprises Buy Refurbished Dell DDR4 Memory


Most companies running Dell 13th–15th Gen PowerEdge servers choose refurbished DDR4 memory because:


  • Much lower cost than new

  • Long warranties from serious suppliers

  • Fully tested modules

  • Fast availability

  • No performance difference compared to new modules

  • Ideal for budget-controlled environments


This makes refurbished Dell PowerEdge DDR4 memory one of the best ROI upgrades for existing infrastructure.



Choosing the Right Dell PowerEdge DDR4 Memory Module


Step 1 – Identify your server model

Example: PowerEdge R630, R740, R640, R440, T640, etc.


Step 2 – Check whether your current configuration uses RDIMM or LRDIMM

You cannot mix RDIMM and LRDIMM.


Step 3 – Confirm the DDR4 speed based on CPU and generation

2133 / 2400 / 2666 / 2933 / 3200 MT/s, depending on platform.


Step 4 – Select the memory capacity per module

  • 16GB / 32GB RDIMM → general workloads, smaller hosts

  • 64GB / 128GB LRDIMM → virtualization, SAP, VDI, databases, memory-heavy apps



Sources: Dell PowerEdge DDR4 Memory Module


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