Samsung

Samsung 32GB DDR4-2666 ECC RDIMM

M393A4K40CB2-CTD
Samsung DDR4 RDIMMcompute32GBDDR4-2666RDIMM
$10.05/GB
$321.56
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 19, 2026, 12:00 AM
Buy on Amazon

The Samsung 32GB DDR4-2666 ECC RDIMM is a 32GB DDR4 ECC server memory module in new condition. It is in stock at $321.56 - $10.05/GB.

Part number: M393A4K40CB2-CTD — decoded, with sibling variants and the warranty check.

Same capacity, other options
DriveInterfaceCond$/TBPrice
MICRON 32GB DDR4-2400 ECC RDIMMDDR4-2400New$7359.36$229.98Buy on Amazon
Samsung 32GB DDR4-2666 ECC RDIMMDDR4-2666New$10289.92$321.56Buy on Amazon
Kingston 32GB DDR4-2666 ECC RDIMMDDR4-2666New$11199.68$349.99Buy on Amazon
Kingston 32GB DDR5-5600 ECC RDIMMDDR5-5600Refurb$41599.68$1299.99Buy on Amazon
Model context

Part of the Samsung line we track.

Quick Verdict

Samsung 32GB DDR4-2666 ECC RDIMM at $10.05/GB. 3-year warranty. Verify your server's QVL before purchase.

Share:WhatsAppFacebookPost on X

Specifications

Capacity32GB
Module TypeRDIMM
GenerationDDR4
Speed2666 MT/s
ECCYes
Rank / Org—
Warranty3 years
ASINB0862GG8LZ
Market context

Against every other module we have an in-stock price for today, this one is cheaper per gb than 63% of them (26 of 41). The cheapest we can currently buy is $4.92/GB; the middle of the market is $12.44/GB.

Compare against every 0.03125TB drive we track →Cheapest per terabyte, all categories →Category price trends →
How it compares - 32GBDDR4-2666
#1A-Tech 32GB DDR4-2666 ECC RDIMM
$7.40/GB
#2SK Hynix 32GB DDR4-2666 ECC RDIMM
$8.72/GB
#3Samsung 32GB DDR4-2666 ECC RDIMM
$10.05/GB
#4Samsung 32GB DDR4-2666 ECC RDIMMTHIS DRIVE
$10.05/GB
#5Kingston 32GB DDR4-2666 ECC RDIMM
$10.94/GB

Also appears in

Brands
Price trends
Other pages
Best-of verdicts

Frequently Asked Questions

Yes. At our last check it was $321.56 ($10,289.92 per terabyte at its 0.03125TB capacity), sold new under ASIN B0862GG8LZ. Amazon sets the final price at checkout.

This listing (M393A4K40CB2-CTD, ASIN B0862GG8LZ) 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. The stored warranty on this row is 3 years, as the listing states it.

This row (ASIN B0862GG8LZ) is stored as a DDR4 RDIMM at DDR4-2666. 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 32GB 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.