The Samsung M393AAG40M32-CAE is a 128GB DDR4 Registered DIMM (RDIMM) built for enterprise servers and workstation platforms that support ECC registered memory. It’s designed to improve signal integrity and stability in high-capacity memory configurations, making it a solid choice for virtualization hosts, database servers, and memory-dense compute nodes.
Who it’s for
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IT teams / data centers upgrading server RAM capacity for VMware/Hyper-V, containers, or VDI
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Database / analytics workloads that benefit from large memory pools
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Compute and storage servers that require ECC RDIMM for reliability
Specs
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Capacity: 128GB
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Memory type: DDR4 Registered DIMM (RDIMM)
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Speed: 3200 Mbps (DDR4-3200 class)
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Voltage: 1.2V
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Rank / organization: 4R x4
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Pins: 288-pin
FAQ
1) Is this compatible with desktops or gaming PCs?
Usually no. This is a server RDIMM, and most consumer motherboards only support UDIMM (unbuffered) memory.
2) Does it support ECC?
It’s a Registered DIMM designed for server reliability and includes error-correction capability as part of the RDIMM design concept (ECC support depends on your CPU/motherboard).
3) What does “4R x4” mean, and why does it matter?
It indicates a quad-rank x4 organization. Some servers have limits on ranks per channel/DIMM slots, so you should confirm your platform supports 128GB 4R modules before ordering.
4) Will it run at DDR4-3200 in any server?
It can only run at 3200 if your CPU/motherboard and population rules support it; otherwise it may downclock to a supported speed.
5) Is this part still in production?
Samsung lists the production status as EOL for this exact part number, so availability may be limited to existing stock in the channel.
If you share the server model or motherboard + CPU, I can tell you whether it supports 128GB 4R RDIMMs and the best slot population for it.
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Mfr Part Number: M393AAG40M32-CAE
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Type: DDR4 RDIMM
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Capacity: 128 GB
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Speed: PC4-25600 3200Mbps
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Size & Bit: (3DS 2H 8G x 4) x 36
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Pins: 288pin
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ECC: Yes
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Registered: Yes
- 4R x 4
- 1.2V
