Samsung M393A4K40DB3-CWE

Technical Overview

Samsung M393A4K40DB3-CWE is a 32GB DDR4-3200 RDIMM with a 2Rx4 organization and ECC. The module name is PC4-25600R. Samsung builds both the DRAM and the finished server module.

Most requests start from the number on the label, or from a build that needs 32GB DDR4-3200 RDIMM 2Rx4. Send the exact part number when you have it. If you only know the specification, send capacity, speed, module type and rank.

How to Read This Part Number

• M393A — Samsung DDR4 RDIMM family
• 4K40 — 32GB module density (x4 dual-rank)
• DB3 — die and package revision
• CWE — DDR4-3200 speed grade

Use the full code on the quote. Nearby 4G43 parts are typically 2Rx8. Nearby EB3 codes share the same density class but use a different die revision.

Key Specifications

Part Number: M393A4K40DB3-CWE
 Manufacturer: Samsung
 Capacity: 32GB (1x 32GB)
 Memory Type: DDR4 SDRAM
 Module Type: RDIMM (Registered DIMM)
 Speed: 3200 MT/s
 Module Name: PC4-25600R
 Rank / Organization: 2Rx4
 Error Correction: ECC
 Voltage: 1.2V
 Pin Count: 288-pin
 Form Factor: Standard-height DIMM

Before adding memory to a populated server, match these values against the modules already installed: capacity, DDR generation, RDIMM or LRDIMM, rank, organization, speed and voltage. Also confirm the server CPU and motherboard list 32GB 2Rx4 RDIMM as supported.

RDIMM vs LRDIMM

This module is an RDIMM. Mixing RDIMM and LRDIMM in the same population is usually not allowed. If the installed memory is LRDIMM, quote an LRDIMM equivalent, or send a photo of the current label.

Where This Module Is Used

• Replacing the same Samsung 32GB DDR4 RDIMM already in the server
• Entry and mid-capacity upgrades that specify 32GB DDR4-3200 RDIMM, 2Rx4
• Balanced server builds and spare stock that call out this exact code

The same Samsung module may also appear under an HPE, Dell, Cisco, Supermicro or Lenovo label. If you need the OEM-labeled stick, include that number on the quote as well.

Matching Related Modules

A different speed, rank, density, or RDIMM vs LRDIMM code is a different product. Before approving a substitute, match:

• 32GB
• DDR4-3200 / PC4-25600R
• RDIMM
• 2Rx4
• ECC
• 1.2V / 288-pin

Do not treat a 32GB 2Rx8 module (for example 4G43), a DDR4-2666/2933 4K40 part, or an LRDIMM as a drop-in for this CWE 2Rx4 stick. If the label shows EB3 instead of DB3, send that exact code.

What to Send for a Quote

1. Part number: M393A4K40DB3-CWE
2. Quantity
3. Optional: server brand and model
4. Optional: photo of the module label
5. Or: 32GB + DDR4-3200 + RDIMM + 2Rx4

Mixed lists are fine, including other DDR4/DDR5 lines and OEM-labeled pulled memory.

FAQ

Is this an LRDIMM?
 No. It is a Samsung DDR4 RDIMM (M393A). Confirm the installed type before ordering.

Is this the same as M393A4G43AB3-CWE?
 Same 32GB / DDR4-3200 class, but that part is 2Rx8. This part is 2Rx4. Quote the exact number on your label.

Is this the same as M393A4K40EB3-CWE?
 Same 32GB / DDR4-3200 / 2Rx4 class, but DB3 and EB3 are different die revisions. Quote the exact number on your label.

Will any DDR4 server take 32GB 2Rx4 modules?
 Most DDR4 RDIMM platforms do, but always confirm the QVL or memory guide for your CPU and motherboard.

Can I order only a few pieces?
 Yes. Orders can start at two modules.

Do you quote OEM-labeled versions too?
 Yes. Include the HPE, Dell, Cisco, Supermicro or Lenovo number if the server needs that label.