---
product_id: 745449206
title: "A-Tech 512GB Kit (4x128GB) DDR4 2666MHz PC4-21300 ECC RDIMM 8Rx4 (3DS 2S4Rx4) Octal Rank 1.2V ECC Registered DIMM 288-Pin Server & Workstation RAM Memory Upgrade Modules (A-Tech Enterprise Series)"
brand: "a-tech"
price: "¥673774"
currency: JPY
in_stock: false
reviews_count: 13
url: https://www.desertcart.jp/products/745449206-a-tech-512gb-kit-4x128gb-ddr4-2666mhz-pc4-21300-ecc
store_origin: JP
region: Japan
---

# 2666MHz high-speed DDR4 512GB total capacity ECC Registered for error correction A-Tech 512GB Kit (4x128GB) DDR4 2666MHz PC4-21300 ECC RDIMM 8Rx4 (3DS 2S4Rx4) Octal Rank 1.2V ECC Registered DIMM 288-Pin Server & Workstation RAM Memory Upgrade Modules (A-Tech Enterprise Series)

**Brand:** a-tech
**Price:** ¥673774
**Availability:** ❌ Out of Stock

## Summary

> 🚀 Upgrade to unstoppable server power with A-Tech 512GB DDR4 ECC RAM!

## Quick Answers

- **What is this?** A-Tech 512GB Kit (4x128GB) DDR4 2666MHz PC4-21300 ECC RDIMM 8Rx4 (3DS 2S4Rx4) Octal Rank 1.2V ECC Registered DIMM 288-Pin Server & Workstation RAM Memory Upgrade Modules (A-Tech Enterprise Series) by a-tech
- **How much does it cost?** ¥673774 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/745449206-a-tech-512gb-kit-4x128gb-ddr4-2666mhz-pc4-21300-ecc)

## Best For

- a-tech enthusiasts

## Why This Product

- Trusted a-tech brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Massive 512GB Memory Kit:** Unleash powerhouse multitasking with 4x128GB modules designed for servers & workstations.
- • **Blazing 2666MHz DDR4 Speed:** Accelerate your workflows and crush bottlenecks with industry-standard PC4-21300 performance.
- • **Enterprise-Grade ECC Registered:** Ensure data integrity and system stability with advanced error-correcting code memory.
- • **Lifetime Warranty & Expert Support:** Invest confidently with A-Tech’s limited lifetime warranty and dedicated support team at your side.
- • **Optimized for Server & Workstation Use:** Built exclusively for select DDR4 servers—no desktop or laptop compatibility, guaranteeing professional-grade reliability.

## Overview

The A-Tech 512GB Kit (4x128GB) DDR4 2666MHz PC4-21300 ECC Registered RDIMM is a high-capacity, high-speed memory upgrade tailored for select servers and workstations. Featuring octal rank 8Rx4 modules with 1.2V JEDEC standard voltage, it delivers robust error correction and enhanced system stability. Perfect for professionals demanding reliable, scalable performance, this kit is backed by a limited lifetime warranty and expert support.

## Description

Buy A-Tech 512GB Kit (4x128GB) DDR4 2666MHz PC4-21300 ECC RDIMM 8Rx4 (3DS 2S4Rx4) Octal Rank 1.2V ECC Registered DIMM 288-Pin Server & Workstation RAM Memory Upgrade Modules (A-Tech Enterprise Series): Memory - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Great purchase, works perfectly - Great purchase. Fast shipping, great packaging and we’ve had installed for nearly six months and they work flawlessly on our 2019 Mac Pro
Review: Great RAM - RAM worked just as it should, glad I bought it before the crazy price stuff happened. Very pleased with my purchase, 10/10.

## Features

- A-Tech RAM Memory compatible for select DDR4 Servers & Workstation systems only; (*WILL NOT WORK with Desktop Computers, Laptop Computers, or PCs of any kind*)
- 512GB RAM Kit (4 x 128GB Modules); DDR4 DIMM 288 Pin; Speeds up to 2666MHz/2667MHz PC4-21300 (PC4-2666V)
- ECC Registered RDIMM; 8Rx4 (3DS 2S4Rx4) - Octal Rank x4; JEDEC DDR4 standard 1.2V
- Improves system performance, workload capacity, and reduces bottlenecks by increasing memory (RAM) resources
- Note: This memory is ECC Registered and cannot be mixed with different ECC types such as ECC Unbuffered, ECC Load Reduced, or Non-ECC Unbuffered; (Memory compatibility can vary among different system models and their installed components; please verify compatibility and follow memory channel guidelines to ensure maximum performance)
- Each A-Tech memory module is built and tested for superior performance and trusted reliability
- All A-Tech products are covered with a Limited Lifetime Warranty and are backed by our top rated support team to help guide you every step of the way

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CJX7SF1R |
| Best Sellers Rank | #99 in Computer Memory |
| Brand | A-Tech |
| Color | 4 Module Kit |
| Computer Memory Type | DDR4 SDRAM |
| Customer Reviews | 4.6 4.6 out of 5 stars (268) |
| Date First Available | September 26, 2023 |
| Item Dimensions LxWxH | 5.25 x 1.23 x 0.15 inches |
| Item Weight | 3.2 ounces |
| Item model number | AT128G4D4D2666RO43DSN12V |
| Manufacturer | A-Tech |
| Product Dimensions | 5.25 x 1.23 x 0.15 inches |
| RAM | 512 GB DDR4 |
| Voltage | 1.2 Volts |

## Product Details

- **Brand:** A-Tech
- **Compatible Devices:** Server, Workstation
- **Computer Memory Size:** 512 GB
- **Memory Speed:** 2666 MHz
- **RAM Memory Technology:** DDR4

## Images

![A-Tech 512GB Kit (4x128GB) DDR4 2666MHz PC4-21300 ECC RDIMM 8Rx4 (3DS 2S4Rx4) Octal Rank 1.2V ECC Registered DIMM 288-Pin Server & Workstation RAM Memory Upgrade Modules (A-Tech Enterprise Series) - Image 1](https://m.media-amazon.com/images/I/61-IGJg2HCL.jpg)
![A-Tech 512GB Kit (4x128GB) DDR4 2666MHz PC4-21300 ECC RDIMM 8Rx4 (3DS 2S4Rx4) Octal Rank 1.2V ECC Registered DIMM 288-Pin Server & Workstation RAM Memory Upgrade Modules (A-Tech Enterprise Series) - Image 2](https://m.media-amazon.com/images/I/718XzhQu7mL.jpg)
![A-Tech 512GB Kit (4x128GB) DDR4 2666MHz PC4-21300 ECC RDIMM 8Rx4 (3DS 2S4Rx4) Octal Rank 1.2V ECC Registered DIMM 288-Pin Server & Workstation RAM Memory Upgrade Modules (A-Tech Enterprise Series) - Image 3](https://m.media-amazon.com/images/I/71kV+DRPnRL.jpg)
![A-Tech 512GB Kit (4x128GB) DDR4 2666MHz PC4-21300 ECC RDIMM 8Rx4 (3DS 2S4Rx4) Octal Rank 1.2V ECC Registered DIMM 288-Pin Server & Workstation RAM Memory Upgrade Modules (A-Tech Enterprise Series) - Image 4](https://m.media-amazon.com/images/I/81Hyp3y2GQL.jpg)
![A-Tech 512GB Kit (4x128GB) DDR4 2666MHz PC4-21300 ECC RDIMM 8Rx4 (3DS 2S4Rx4) Octal Rank 1.2V ECC Registered DIMM 288-Pin Server & Workstation RAM Memory Upgrade Modules (A-Tech Enterprise Series) - Image 5](https://m.media-amazon.com/images/I/81edSpCFSyL.jpg)

## Questions & Answers

**Q: Will this work in my desktop computer?**
A: No, this memory is designed for servers and select workstations that support DDR4 ECC Registered memory only. If you’re unsure, contact our support team, we’re happy to help you find the exact memory your system needs!

**Q: What’s the difference between DDR4 and other types of memory and can I use them interchangeably?**
A: No, DDR4 memory is not compatible or interchangeable with other types such as DDR5, DDR3, and so on. Each memory type uses different slot designs, voltages, and architectures, so your system must support the memory type specifically.

**Q: Can I mix ECC Registered (ECC RDIMM) modules with other ECC types?**
A: No, you cannot mix ECC Registered with ECC Unbuffered (ECC UDIMM), Load-Reduced (LRDIMM), or Non-ECC Unbuffered (Non-ECC UDIMM) modules. All installed memory modules must be the same ECC type or your system will fail to boot.

**Q: What ECC type does my system need and which slots should I use?**
A: Refer to your system or motherboard manual for supported ECC types and correct memory channel configuration. Using the wrong type or incorrect slot population can cause boot failures or reduce system stability.

**Q: Why isn't my memory running at the advertised speed?**
A: Memory speed can drop when more DIMMs are installed per channel due to increased electrical load. This is normal and can vary based on your system’s design. Check your server’s memory population and configuration rules for optimal performance.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great purchase, works perfectly
*by E***E on December 4, 2025*

Great purchase. Fast shipping, great packaging and we’ve had installed for nearly six months and they work flawlessly on our 2019 Mac Pro

### ⭐⭐⭐⭐⭐ Great RAM
*by A***P on December 7, 2025*

RAM worked just as it should, glad I bought it before the crazy price stuff happened. Very pleased with my purchase, 10/10.

### ⭐⭐⭐⭐⭐ A-Tech 8GB DDR4 2133MHz PC4-17000 ECC RDIMM 1Rx4
*by F***S on January 13, 2026*

These RAM modules were basically plug and play and certainly will help expedite my photograph editing.

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-01-29*