---
product_id: 745449206
title: "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: "VT864664"
currency: VUV
in_stock: true
reviews_count: 8
url: https://www.desertcart.vu/products/745449206-512gb-kit-4x128gb-ddr4-2666mhz-pc4-21300-ecc-rdimm-8rx4
store_origin: VU
region: Vanuatu
---

# 2666MHz high-speed DDR4 512GB total capacity ECC Registered for error correction 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:** VT864664
**Availability:** ✅ In Stock

## Summary

> 🚀 Power your server with elite 512GB DDR4 ECC memory — because downtime is not an option.

## Quick Answers

- **What is this?** 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?** VT864664 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/745449206-512gb-kit-4x128gb-ddr4-2666mhz-pc4-21300-ecc-rdimm-8rx4)

## 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 heavy-duty servers and workstations.
- • **Blazing Fast 2666MHz Speed:** Accelerate your workflows and reduce bottlenecks with industry-standard DDR4 PC4-21300 performance.
- • **Octal Rank 8Rx4 Architecture:** Optimized multi-rank design for enhanced bandwidth and reliability in enterprise environments.
- • **Error-Correcting ECC Registered:** Ensure rock-solid data integrity and system stability under mission-critical loads.
- • **Lifetime Warranty & Expert Support:** Invest with confidence backed by A-Tech’s trusted lifetime warranty and dedicated professional assistance.

## Overview

The A-Tech 512GB Kit (4x128GB) DDR4 2666MHz PC4-21300 ECC Registered RDIMM is a high-capacity, enterprise-grade memory upgrade tailored exclusively for select DDR4 servers and workstations. Featuring error-correcting code (ECC) technology and octal rank architecture, it delivers superior reliability and performance at 1.2V, ensuring your critical systems run smoothly with minimized data errors. This kit is not compatible with desktops or laptops and comes with a limited lifetime warranty supported by expert customer service.

## Description

Full description not available

## 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 |
|---------------|-------|
| RAM | 512 GB DDR4 |
| Brand | A-Tech |
| Item model number | AT128G4D4D2666RO43DSN12V |
| Item Weight | 3.2 ounces |
| Product Dimensions | 5.25 x 1.23 x 0.15 inches |
| Item Dimensions  LxWxH | 5.25 x 1.23 x 0.15 inches |
| Color | 4 Module Kit |
| Computer Memory Type | DDR4 SDRAM |
| Voltage | 1.2 Volts |
| Manufacturer | A-Tech |
| ASIN | B0CJX7SF1R |
| Date First Available | September 26, 2023 |

## Product Details

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

## Images

![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/81edSpCFSyL.jpg)
![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/81xNUYk4teL.jpg)
![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)
![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)
![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/81oSFJ+9nuL.jpg)

## Available Options

This product comes in different **Color, Size, Style** options.

## 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

### ⭐⭐⭐⭐⭐ It worked on install. 🔥
*by T***N on June 22, 2025*

Why did you pick this product vs others?:It was largest stable ram choice for my dual cpu multi gpu computer ,from a noted producer.Ease of installation:Super easy.Memory upgrade:256gb over 64 total and mixed which is bad.Memory quality:above boardSpeed:above boardPerformance:Above board Compatibility:Worked perfectly for my Machinist x99 dual cpu mobo

### ⭐⭐⭐⭐⭐ The best upgrade for a Dell 5820!
*by T***N on February 6, 2025*

Bought four kits and they work like a charm. Easy installation and a quick upgrade. Huge value for the money spent. Speed, Stability and Memory capacity is perfect. Nothing on the outside of the computer tells how great it looks inside.

### ⭐⭐⭐⭐⭐ Works as expected
*by N***7 on June 20, 2025*

Initial review after 1 hour. Will update if anything changes.Bought A-Tech kit containing two 16GB 3200MHz ECC modules for Dell Precision 5820 workstation with Xeon W-2223 cpu. Existing ECC memory are two 8GB modules supplied by Dell: each 8GB module is a Micron part rated at 3200MHz but the 5820 runs them at 2666MHz system memory. The manual does not document mixing 8GB with 16GB modules but I wanted 48GB total. I kept the two 8GB in DIMM1 and DIMM2, and finally added the two 16GB in DIMM3 and DIMM4. The motherboard has the physical slots out of order with the DIMMx numbering so pay attention (initially I put the 16GB modules in DIMM5 and DIMM6 but my test application ran ~20% slower than final DIMM3 and DIMM4 locations). Make sure the side cover is back in place before booting the Dell 5820. The BIOS picked up the memory had changed and then booted into my OS. All good - Ubuntu 22.04 OS shows 48GB RAM available. Good product.

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**Shop now:** [https://www.desertcart.vu/products/745449206-512gb-kit-4x128gb-ddr4-2666mhz-pc4-21300-ecc-rdimm-8rx4](https://www.desertcart.vu/products/745449206-512gb-kit-4x128gb-ddr4-2666mhz-pc4-21300-ecc-rdimm-8rx4)

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-01-23*