DatacenterDisk
Samsung

Samsung 16GB DDR5-4800 ECC RDIMM

M321R2GA3BB6-CQK
Samsung DDR5 RDIMMmemory16GBDDR5-4800RDIMM
$43.69/GB
$699.00
newIn Stock
This offer: sold by CorteseInc · Amazon says New / Unknown
Prices refresh about once a day
Price updated
Price accurate as of Oct 22, 2026, 01:19 PM
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The Samsung 16GB DDR5-4800 ECC RDIMM is a 16GB DDR5 ECC server memory module in new condition. It is in stock at $699.00 - $43.69/GB.

Part number: M321R2GA3BB6-CQK — 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
Crucial 16GB DDR4-2400 ECC RDIMMDDR4-2400New$11519.36$179.99Buy on Amazon
Samsung 16GB DDR4-2666 ECC RDIMMDDR4-2666New$12354.56$193.04Buy on Amazon
Kingston 16GB DDR4-2666 ECC UDIMMDDR4-2666New$12736.64$199.01Buy on Amazon
Model context

Part of the Samsung line we track.

Quick Verdict

Samsung 16GB DDR5-4800 ECC RDIMM at $43.69/GB. Warranty varies by seller. Verify your server's QVL before purchase.

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Specifications

Capacity16GB
Module TypeRDIMM
GenerationDDR5
Speed4800 MT/s
ECCYes
Rank / Org—
Warranty—
ASINB0CFG8Z96C
Market context

Against every other module we have an in-stock price for today, this one is cheaper per gb than 33% of them (13 of 40). The cheapest we can currently buy is $4.92/GB; the middle of the market is $11.66/GB.

Compare against every 0.015625TB drive we track →Cheapest per terabyte, all categories →Category price trends →

Works in these servers

Dell R660
DDR5 · 32 slots · memory rules + live prices →
Dell R760
DDR5 · 32 slots · memory rules + live prices →
Dell R760xs
DDR5 · 16 slots · memory rules + live prices →
HPE DL360 Gen11
DDR5 · 32 slots · memory rules + live prices →
HPE DL380 Gen11
DDR5 · 32 slots · memory rules + live prices →
Lenovo SR630 V3
DDR5 · 32 slots · memory rules + live prices →
Lenovo SR650 V3
DDR5 · 32 slots · memory rules + live prices →
Supermicro H13SSL-N
DDR5 · 12 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
Brands
Price trends

Frequently Asked Questions

Yes. At our last check it was $699.00 ($44,736.00 per terabyte at its 0.015625TB capacity), sold new under ASIN B0CFG8Z96C. Amazon sets the final price at checkout.

This listing (M321R2GA3BB6-CQK, ASIN B0CFG8Z96C) 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 B0CFG8Z96C) is stored as a DDR5 RDIMM at DDR5-4800. A DDR5 module fits only a DDR5 platform (the keying and voltage differ by generation), and registered and unbuffered modules are not interchangeable - check your board's memory specification for DDR5 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.