DatacenterDisk
Samsung

Samsung 16GB DDR4-2133 ECC RDIMM

M393A2G40EB1-CPB
Samsung DDR4 RDIMMmemory16GBDDR4-2133RDIMM
$7.12/GB
$113.94
newIn Stock
This offer: sold by A-Tech Components · Amazon says New / Unknown
Prices refresh about once a day
Price updated
Price accurate as of Oct 22, 2026, 01:19 AM
Buy on Amazon

The Samsung 16GB DDR4-2133 ECC RDIMM is a 16GB DDR4 ECC server memory module in new condition. It is in stock at $113.94 - $7.12/GB.

Part number: M393A2G40EB1-CPB — decoded, with sibling variants and the warranty check.

Same capacity, other options
DriveInterfaceCond$/TBPrice
A-Tech 16GB DDR4-2133 ECC RDIMMDDR4-2133New$5566.72$86.98Buy on Amazon
Samsung 16GB DDR4-2666 ECC RDIMMDDR4-2666Refurb$8959.36$139.99Buy on Amazon
Crucial 16GB DDR4-2400 ECC RDIMMDDR4-2400New$11519.36$179.99Buy on Amazon
Samsung 16GB DDR5-4800 ECC RDIMMDDR5-4800Refurb$40896.00$639.00Buy on Amazon
Model context

Part of the Samsung line we track.

Quick Verdict

Samsung 16GB DDR4-2133 ECC RDIMM at $7.12/GB. Warranty varies by seller. Verify your server's QVL before purchase.

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Specifications

Capacity16GB
Module TypeRDIMM
GenerationDDR4
Speed2133 MT/s
ECCYes
Rank / Org—
Warranty—
ASINB01MCQBZW5
Market context

Against every other module we have an in-stock price for today, this one is cheaper per gb than 88% of them (35 of 40). The cheapest we can currently buy is $4.92/GB; the middle of the market is $12.25/GB.

Compare against every 0.015625TB drive we track →Cheapest per terabyte, all categories →Category price trends →
How it compares - 16GBDDR4-2133
#1A-Tech 16GB DDR4-2133 ECC RDIMM
$5.44/GB
#2Samsung 16GB DDR4-2133 ECC RDIMMTHIS DRIVE
$7.12/GB

Compare to similar 16GB DDR4-2133 modules

A-Tech
16GB DDR4-2133 ECC RDIMM
$5.44/GB
$86.98
new

Works in these servers

Dell R730
DDR4 · 24 slots · memory rules + live prices →
HPE DL360 Gen10
DDR4 · 24 slots · memory rules + live prices →
HPE DL380 Gen10
DDR4 · 24 slots · memory rules + live prices →
HPE ML350 Gen10
DDR4 · 24 slots · memory rules + live prices →
Supermicro X11SPL-F
DDR4 · 8 slots · memory rules + live prices →
Supermicro X11SPi-TF
DDR4 · 8 slots · memory rules + live prices →

Compatibility per each platform's verified OEM rules (generation, module type, speed floor, per-DIMM max). Always confirm against the vendor QVL for your exact configuration.

Find the right config for your server - the Memory Finder turns those rules into priced DIMM configurations.

Also appears in

Server memory
Other pages
AI storage
Prices and forecast

Frequently Asked Questions

Yes. At our last check it was $113.94 ($7,292.16 per terabyte at its 0.015625TB capacity), sold new under ASIN B01MCQBZW5. Amazon sets the final price at checkout.

This listing (M393A2G40EB1-CPB, ASIN B01MCQBZW5) carries no renewed, recertified, refurbished or pulled claim in its title, and Amazon reports it as new. On this site that is what "new" means: sold as factory-new.

This row (ASIN B01MCQBZW5) is stored as a DDR4 RDIMM at DDR4-2133. A DDR4 module fits only a DDR4 platform (the keying and voltage differ by generation), and registered and unbuffered modules are not interchangeable - check your board's memory specification for DDR4 RDIMM support.

Use Case Scenarios

🖥️
Virtualization Host Density
Proxmox, ESXi or Hyper-V host packing more VMs per socket.
✓ Excellent fit
RAM is the binding constraint on VM density long before CPU. Adding 16GB ECC modules lets a host carry more guests per socket, and ECC prevents a single bit-flip from corrupting a guest's memory.
💾
ZFS ARC Cache
TrueNAS or ZFS server where read performance depends on cache hit rate.
✓ Excellent fit
ZFS turns every spare gigabyte into ARC read cache — more RAM directly raises cache hit rates on active datasets. ECC is strongly recommended for ZFS, whose integrity guarantees assume trustworthy memory.
🗄️
Database Working Set
PostgreSQL, MySQL or in-memory analytics needing the working set resident.
✓ Excellent fit
Databases live or die on buffer pool size. Fitting the working set in memory converts disk reads into RAM reads — a latency improvement no storage upgrade matches. ECC protects against silent corruption in long-running instances.
🏠
Homelab ECC Upgrade
Home server or NAS build stepping up from consumer memory.
~ Good fit
For 24/7 homelab duty, ECC server memory at today's used/refurb prices is often cheaper per GB than new consumer RAM — with error correction included. Verify your board and CPU actually support ECC before buying.

Maintenance & Troubleshooting

Maintenance Checklist

On installRun a full memtest86+ pass
Boot memtest86+ and let it complete at least one full pass before trusting the module with production data. Catches infant-mortality defects and seating problems immediately.
On installVerify detected speed and channel population
Check BIOS/IPMI that the module runs at the expected MT/s and that channels are populated per the motherboard manual's DIMM order. Uneven population silently costs bandwidth.
MonthlyReview ECC error counters
Check IPMI/iDRAC/iLO event logs, or edac-util on Linux, for corrected ECC errors. Occasional corrected errors are normal; a climbing count on one DIMM predicts failure — replace it.
AnnuallyReseat and dust during maintenance windows
Airflow debris and socket oxidation cause intermittent errors. During planned downtime, blow out slots and reseat modules showing any corrected-error history.

Troubleshooting Guide

Cause: Unsupported module type (UDIMM vs RDIMM), wrong DDR generation, or incorrect slot population order.
Fix: Confirm the platform supports this exact type and generation (check the QVL), install in the manual's specified slot order, and reseat firmly until both latches click.