Condition: Refurbished
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The Samsung M386AAK40B40-CTC is a 128GB DDR4-2400 LRDIMM for servers. It uses stacked memory chips, runs at 1.2V, and has 288 pins. The label reads 128GB 2S4Rx4 PC4-2400T-L, which sellers also write as 8Rx4.
Samsung lists the module as (4H 3DS 8G x 4) x 36. That is 36 chip packages, and each package stacks four 8Gb dies. 3DS means three-dimensional stacking. The chip math works out like this.
| Item | Amount |
|---|---|
| Chip packages | 36 |
| Dies in each package | 4 |
| Size of each die | 8Gb |
| Raw memory | 1,152Gb (144GB) |
| Data memory | 128GB |
| ECC check bits | 16GB |
Eight logical ranks of x4 chips share the 36 packages. That is why sellers call the module octal rank. The server sees a load that the buffer chips hide.
An LRDIMM carries buffer chips that hide the load of all those memory chips from the controller. That lets a server hold more memory per channel. The trade is a little extra latency and some added power.
The module runs at 2400 MT/s with CL17, which moves 19.2 GB/s. A server runs it at the lower of that speed and the CPU limit. It needs a server that takes DDR4 3DS LRDIMMs, so check your memory guide for 128GB support. It can't share a server with plain RDIMMs, and a desktop PC can't use it.
Twelve modules give 1.5TB. Twenty-four give 3TB.
Both names describe the same module: eight logical ranks of x4 chips.
Four dies stacked in one package and joined by tiny vertical links.
Each die holds 8 gigabits and talks to the module over four data lines.
Stacking adds capacity without adding more chip packages to the board. That is how 128GB fits on a standard-size module.
The part numbers differ by one letter. Match the suffix on your installed modules.
| Brand | Samsung |
|---|---|
| Part number | M386AAK40B40-CTC |
| Capacity | 128GB |
| Type | DDR4 LRDIMM, 3DS |
| Speed | 2400 MT/s (PC4-19200) |
| Bandwidth | 19.2 GB/s |
| Rank | 2S4Rx4 (8Rx4) |
| CAS latency | CL17 |
| DRAM | 4H 3DS, 8Gb x4 dies |
| Voltage | 1.2V |
| Pins | 288 |
Images may be representative of the product model. For Refurbished items, the actual unit may differ in appearance from the image shown.
Specifications, part number, condition and included accessories are stated on this page.
Refurbished means a used computer part or device that has been cleaned, checked, and repaired to make sure it works properly again. Unlike regular second-hand items, refurbished products go through testing and fixing so they can perform like new.
All orders are processed within 1-2 business days. Orders placed on weekends or public holidays will be processed on the next business day. For more info visit shipping policy.
We offer a 30-day return policy subject to the terms and conditions described in our Refund Policy. Restocking fees may apply to eligible non-faulty returns. Kindly take a look at our Return Policy page.
For Brand New items, you will receive them in their original retail box. For Refurbished items, you will receive them in a Brown Box or Bulk Packaging.
Refurbished printers do not come with ink cartridges or toners.
