Samsung M393AAG40M32-CAE
- Part Number: M393AAG40M32-CAE
- Manufacturer: Samsung
- Capacity: 128GB
- Memory Type: DDR4
- Module Type: RDIMM
- Speed: 3200 MT/s
- Module Name: PC4-25600R
- Rank / Org: 4Rx4
- ECC: Yes
- Voltage: 1.2V
- Pins: 288-pin
This Samsung module is a 128GB DDR4-3200 registered DIMM (RDIMM), 4Rx4, with ECC. Samsung makes both the DRAM and the finished module. It uses 2H 3DS stacking to reach this density and rank configuration.
Use this page when the label shows this part number, or when you need 128GB DDR4-3200 RDIMM 4Rx4 for a high-capacity server build or replacement.
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Technical Overview
Samsung M393AAG40M32-CAE is a 128GB DDR4-3200 RDIMM with a 4Rx4 organization and ECC. The module name is PC4-25600R. Samsung builds both the DRAM and the finished server module. This density uses 2H 3DS DRAM, so platform support and rank rules matter more than on a standard 32GB or 64GB stick.
Most requests start from the number on the label, or from a build that needs 128GB DDR4-3200 RDIMM 4Rx4. 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
- AAG40 — 128GB module density
- M32 — die and package revision (3DS)
- CAE — DDR4-3200 speed grade
Use the full code on the quote. Do not treat an M386A 128GB LRDIMM as the same product.
Key Specifications
Part Number: M393AAG40M32-CAE
Manufacturer: Samsung
Capacity: 128GB (1x 128GB)
Memory Type: DDR4 SDRAM
Module Type: RDIMM (Registered DIMM)
Speed: 3200 MT/s
Module Name: PC4-25600R
Rank / Organization: 4Rx4
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 128GB 4Rx4 3DS 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 (for example M386A), quote an LRDIMM equivalent, or send a photo of the current label.
Where This Module Is Used
- Replacing the same Samsung 128GB DDR4 RDIMM already in the server
- High-capacity upgrades that specify 128GB DDR4-3200 RDIMM, 4Rx4
- Dense memory 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:
- 128GB
- DDR4-3200 / PC4-25600R
- RDIMM
- 4Rx4
- ECC
- 1.2V / 288-pin
Do not treat a 128GB LRDIMM, a non-3DS 64GB RDIMM, or a different speed grade as a drop-in for this CAE 4Rx4 stick.
What to Send for a Quote
- Part number: M393AAG40M32-CAE
- Quantity
- Optional: server brand and model
- Optional: photo of the module label
- Or: 128GB + DDR4-3200 + RDIMM + 4Rx4
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). Nearby M386A 128GB parts are typically LRDIMM. Confirm the installed type before ordering.
Does every DDR4 server take 128GB 4Rx4 3DS modules?
No. Confirm the platform supports 128GB 3DS RDIMM and the rank limits for your CPU and motherboard.
Is this the same as M386AAG40M32 or similar 128GB codes?
Same capacity class only if the label also says RDIMM, 4Rx4, and DDR4-3200. Many 128GB Samsung codes are LRDIMM. Quote the exact number on your label.
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.