A-Tech

A-Tech 4GB DDR4 2666 MHz UDIMM PC4-21300 (PC4-2666V) CL19 DIMM Non-ECC Desktop RAM Memory Module

Name: A-Tech 4GB DDR4 2666 MHz UDIMM PC4-21300 (PC4-2666V) CL19 DIMM Non-ECC Desktop RAM Memory Module
Brand: A-Tech
SKU: B07WJV39NZ

Status: A-Tech 4GB DDR4 2666 MHz UDIMM PC4-21300 (4GB DDR4 desktop DIMM kit): Unavailable on Amazon as of 2026-10-03 22:25 UTC. SpecPicks has no in-stock 4GB DDR4 desktop DIMM kit on file; an Amazon search for "4GB DDR4 desktop DIMM kit" lists current offers with the same specs. eBay sellers may still list this model new or used.

Search Amazon for a 4GB DDR4 desktop DIMM kit → 🛒 Search eBay for this model

Bottom line: The A-Tech 4GB DDR4 2666 MHz UDIMM PC4-21300: A-Tech lifetime warranty plus pre- and post-sale tech support; main trade-off: single 4GB module - most modern builds want 8GB or 16GB.

Unavailable on Amazon as of 2026-10-03 22:25 UTC

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Search Amazon for an in-stock 4GB DDR4 desktop DIMM kit → Original listing (currently unavailable) → Compare to similar memory (ram)

By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-03

Mike Perry — Hardware researcher since 2014. For desktop and laptop memory upgrades, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference. About the author →

Pros & Cons

Pros

✓ A-Tech lifetime warranty plus pre- and post-sale tech support
✓ JEDEC-standard 1.2V DDR4 - no BIOS or voltage tweaking
✓ 288-pin DIMM installs in minutes with no tools beyond a case opener
✓ PC4-21300 / 2666MHz speed matches most stock DDR4 desktop boards

Cons

✗ Single 4GB module - most modern builds want 8GB or 16GB
✗ CL19 latency is loose next to enthusiast CL16 DDR4 kits
✗ Non-ECC only, so it rules out ECC workstations and servers
✗ Sold as one stick, so dual-channel needs a second matched purchase

Manufacturer description

This is a 288-pin DIMM rated at PC4-21300 (PC4-2666V) with CL19 timings, running on the JEDEC DDR4 standard 1.2V so it drops into a supported board without BIOS tuning or a voltage bump. It is non-ECC and unbuffered, built as a single-rank 1Rx8 or 1Rx16 module, which makes it the right fit for consumer and small-office desktops rather than servers that require registered ECC memory. Installation is genuinely a two-minute job: open the case, line up the notch, press until the clips latch. A-Tech backs the module with a lifetime warranty and staffs a tech support team that answers questions…

SpecPicks Verdict

SpecPicks scored A-Tech 4GB DDR4 2666 MHz UDIMM PC4-21300 (PC4-2666V) CL19 DIMM… using a rating × review-volume × price-fit model applied to published specs and reviews across the memory (ram) category. A-Tech's memory (ram) lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for memory (ram) of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

Will this A-Tech 4GB module work in my desktop?

It fits select DDR4 desktops with a 288-pin DIMM slot and supports speeds up to 2666MHz (PC4-21300). Check your motherboard manual or A-Tech's compatibility tool before ordering, since DDR4 will not seat in a DDR3 board.

Is this a single stick or a kit?

It is a single 4GB RAM module. If you want dual-channel operation, you will need to buy two and install them in matched slots.

Does this memory have ECC?

No. It is non-ECC unbuffered memory built for consumer and office desktops. Servers or workstations that require registered or ECC memory will not accept it.

What warranty comes with it?

A-Tech backs the module with a lifetime warranty and offers a tech support team you can reach both before and after purchase. Check the product listing for current claim details.

Do I need to change BIOS settings after installing it?

Usually not. The module runs at the JEDEC DDR4 standard 1.2V with CL19 timings, so a supported board should detect it and run it at up to 2666MHz automatically.

Key Features

Compatible with select DDR4 Desktop computers + Easy to install at home, no expertise required
Maximize your system's performance, boost loading speeds and multitask with ease
Backed by A-Tech's Lifetime Warranty + Friendly tech support team available to help before and after your purchase
Single 4GB RAM Module | DDR4 DIMM 288-Pin | Speeds up to 2666MHz (2667MHz), PC4-21300 / PC4-2666V
NON-ECC Unbuffered | 1Rx8 or 1Rx16 - Single Rank | JEDEC DDR4 standard 1.2V

Full Specifications

Brand	A-Tech
Voltage	1.2 Volts
RAM Size	4 GB
Form Factor	DIMM
Memory Speed	2666 MHz
Model Number	AT4G1D4D2666NN12V
Number of Pins	288
Mfr Part Number	AT4G1D4D2666NN12V
Memory Generation	DDR4
Compatible Devices	Desktop, Workstation
Data Transfer Rate	21300 Megabytes Per Second
Memory Form Factor	UDIMM
Additional Features	Lightweight
Computer Memory Size	4 GB
Warranty Description	Limited Lifetime Warranty Covering Defects In Materials And Workmanship
RAM Memory Technology	DDR4
Column Address Strobe Latency	19

Ready to buy?

A-Tech 4GB DDR4 2666 MHz UDIMM PC4-21300 (PC4-2666V) CL19 DIMM Non-ECC Desktop RAM Memory Module is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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