Condition: Refurbished
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The Samsung M321R4GA0PB0-CWM is a 32GB DDR5-5600 registered DIMM for servers. It is single rank with x4 chips, runs at 1.1V, and has 288 pins. The label reads 32GB 1Rx4 PC5-44800B-R, and sellers often add EC8.
A CL number counts clock cycles, and DDR5 clocks tick faster than DDR4 clocks. So CL46 sounds slow but is not. Multiply the CL by the clock time to get the real delay in nanoseconds.
| Module type | Data rate | CL | Delay to first data |
|---|---|---|---|
| DDR4-3200 | 3200 MT/s | 22 | 13.75 ns |
| DDR5-4800 | 4800 MT/s | 40 | 16.7 ns |
| DDR5-5600 (this module) | 5600 MT/s | 46 | 16.4 ns |
This module has about the same first-data delay as DDR5-4800 and 17% more bandwidth: 44.8 GB/s against 38.4 GB/s. The timing is 46-45-45 at 1.1V.
Sellers also list versions of this Samsung module that add two letters, such as CWMXJ, CWMJH, CWMKJ, and CWMKH. They show the same size, rank, and speed. The part number on your label is the one to match.
The module has one rank of x4 chips. Each DDR5 module has two 32-bit sub-channels, and ECC adds 8 check bits to each one. That is the EC8 tag. Each sub-channel uses ten x4 chips, so the module carries twenty. Memory.net lists 16Gb chips, which is how 32GB adds up.
A server that takes this module has to support DDR5 RDIMMs at 5600 MT/s. If the CPU tops out at 4800, the module runs at 4800. It can't share a server with unbuffered DIMMs, and a desktop PC can't use it. Sixteen modules give 512GB.
Single rank. The 1R in 1Rx4 means one rank.
No. Registered ECC modules need a server board.
It is the speed suffix at the end of the Samsung part number. Sellers list it as DDR5-5600 with 46-45-45 timing.
Yes. In a server limited to DDR5-4800, the module drops to 4800 MT/s and runs at that speed.
| Brand | Samsung |
|---|---|
| Part number | M321R4GA0PB0-CWM |
| Capacity | 32GB |
| Type | DDR5 RDIMM |
| Speed | 5600 MT/s (PC5-44800) |
| Bandwidth | 44.8 GB/s |
| Rank | 1Rx4 |
| Timing | CL46 (46-45-45) |
| Error check | ECC (EC8) |
| Voltage | 1.1V |
| 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.
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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.
