Samsung
A-Tech 8GB Replacement for Samsung M391A1K43BB2-CTD - DDR4 2666MHz PC4-21300 ECC Unbuffered UDIMM 1rx8 1.2v - Single Server Memory Ram Stick (M391A1K43BB2-CTD-ATC)
At $16.25/GB — DDR4 market rate.
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At a Glance
Strengths
- +Compatible with 4 CPU platforms
Limitations
- −61% above the overall DDR4 market average $/GB
- −Limited review data — only 2 Amazon reviews
- −Limited price history — recently added to tracking, trends not yet available
- −Requires ECC-compatible CPU and motherboard — not supported on most consumer platforms
- −Single-stick configuration — runs in single-channel mode unless paired with another stick
- −Availability unconfirmed — may be out of stock or delisted
All points are derived from price data, customer ratings, and product specifications — not editorial opinion. Updated daily.
Is This RAM Right for You?
Based on 8GB DDR4 ECC DIMM specifications.
ECC RAM is not supported on gaming platforms (consumer CPUs/boards)
ECC RAM requires server-grade hardware — not compatible with standard office PCs
ECC RAM protects long renders from silent data corruption — ideal for professional workstations
ECC RAM detects and corrects memory errors — required for data-critical servers and ZFS storage
This is a desktop DIMM — laptop upgrades require SO-DIMM modules. See Laptop RAM Prices for compatible options.
Verdicts based on capacity, form factor, and ECC specifications — not editorial opinion. Capacity recommendations reflect 2026 software requirements.
Price History
Updated daily — track price trends over time
Speed Ranking
Top 46%
2666MHz ranks in the top 46% of all DDR4 speeds tracked (1,762 modules).
Specifications
| Memory Type | DDR4 |
| Capacity | 8GB |
| Speed | 2666MHz |
| Form Factor | DIMM |
| ECC | Yes |
| Voltage | 1.2V |
| ASIN | B07SY934RP |
Compatible Platforms
Always verify with your motherboard's QVL before purchasing.
DDR4 Price by Capacity
Average $/GB across all DDR4 modules in the database
| Capacity | Avg $/GB |
|---|---|
| 8GBThis product | $9.97/GB |
| 16GB | $9.79/GB |
| 32GB | $9.33/GB |
| 64GB | $9.33/GB |
| 128GB | $8.96/GB |
Also available from Samsung
Same brand, different configurations
Samsung
SAMSUNG 8GB DDR4 PC4-19200, 2400MHZ, 288 PIN DIMM, 1.2V, CL 17 Desktop RAM Memory Module M378A1K43BB2-CRC
Samsung
Samsung M378A2K43CB1-CTD 16 GB DDR4 2666 MHz Memory Module - Memory Modules (16 GB, 2 x 8 GB, DDR4, 2666 MHz, 288-pin DIMM, Black, Green)
Samsung
Samsung M378A1K43BB1-CPB 8GB Module DDR4 2133MHz 17000 Non-ECC Memory RAM
Frequently Asked Questions
Is the Samsung 8GB 2666MHz DDR4 compatible with my motherboard?
This module is compatible with Intel 11th Gen Core (LGA1200), Intel 12th / 13th / 14th Gen (LGA1700), Intel Core X / Skylake-X (LGA2066 / X299), AMD Ryzen 1000–5000 (AM4). Always verify with your motherboard's QVL (Qualified Vendor List) before purchasing, as compatibility can vary by board revision.
Is this DDR4 module a good deal right now?
At $129.99 ($16.25/GB), this module is priced near the DDR4 market average. Check the price history chart above to see if prices have been trending up or down recently.
What is 2666MHz RAM used for?
This is an ECC (Error-Correcting Code) RAM module designed for servers, workstations, and NAS systems where data integrity is critical. ECC RAM detects and corrects single-bit memory errors automatically. It requires a compatible CPU and motherboard — most consumer platforms do not support ECC. See our ECC RAM guide for platform compatibility details.
How does Samsung RAM compare to other brands?
Samsung has 137 modules tracked with an average customer rating of 4.6★. Browse all Samsung modules or use the comparison tool to see how it stacks up against Corsair, G.Skill, Kingston, and Crucial.
Similar DDR4 RAM
Crucial
Crucial 8GB Single DDR4 2400 MT/s (PC4-19200) DR x8 DIMM 288-Pin Memory - CT8G4DFD824A
A-Tech
A-Tech 8GB DDR4 2666 MHz UDIMM PC4-21300 (PC4-2666V) CL19 DIMM Non-ECC Desktop RAM Memory Module
Samsung
M471A1K43CB1-CTD 8GB DDR4 PC4-21300, 2666MHZ, 260 PIN SODIMM, 1.2V, CL 19 laptop ram memory module