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A-Tech 16GB (2x8GB) DDR4 2666 MHz UDIMM PC4-21300 (PC4-2666V) CL19 DIMM Non-ECC Desktop RAM Memory Modules

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Availability: 15 left in stock
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Arrives Monday, Oct 12
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Size: 16GB Kit (2 x 8GB)


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
  • 16GB RAM Kit ( 2 x 8GB Modules ) | DDR4 DIMM 288-Pin | Speeds up to 2666MHz (2667MHz), PC4-21300 / PC4-2666V
  • NON-ECC Unbuffered | 1Rx8 or 2Rx8 - Single or Dual Rank | JEDEC DDR4 standard 1.2V

Description

DDR4 2666MHz DIMM DDR4 2933MHz DIMM DDR4 3200MHz DIMM DDR4 2666MHz SODIMM DDR4 3200MHz SODIMM What’s the difference between DDR4 and other types of memory and can I use them interchangeably? 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. What’s the difference between DIMM and SO-DIMM memory? DIMM and SO-DIMM represent two different physical sizes of memory. DIMM is the larger type used in standard desktop computers. SO-DIMM is the smaller type used in laptops, mini PCs, and compact systems. They are not interchangeable. What does "Non-ECC" mean and do I need "ECC" memory instead? Non-ECC (non-error correcting) memory is required for most laptops and desktops. ECC is typically only used in servers or workstations and is not interchangeable with Non-ECC memory. If your system doesn’t mention ECC support, you need Non-ECC. How do I know which speed to choose? Each system has its own max supported speed. If the memory is faster than your system allows, it will automatically downclock to that max speed, meaning it's safe to buy faster memory. To confirm the max supported speed, refer to your system's manual Is this compatible with my system or computer? Refer to your system's manual to confirm the supported memory type, capacity, form factor, and ECC support. If you're unsure, contact our support team, we're happy to help you find the exact memory your system needs! A-Tech is a leading brand of Computer Memory (RAM) based in the United States. We offer a vast variety of memory products to solve all your memory needs; from servers to desktop PCs to laptops and more! All A-Tech products are rigorously tested to ensure high quality, dependable performance. Upgrade your system with confidence with A-Tech memory (RAM). Memory (RAM) gives applications a place to temporarily store data which allows your computer to quickly access information. Using multiple programs/applications at once or doing resource intensive activities (such as video/photo editing, gaming, programming and more) can slow down your system as each compete for a limited amount of memory resource. A RAM upgrade can improve performance by expanding your system's memory capacity allowing your computer to take on more while maintaining a fast and smooth experience. There are many types of RAM including RD, SD, DDR, DDR2, DDR3, DDR4, and DDR5, with DDR5 being the newest version. All system’s have their own memory requirements and will only support one of those specific types of RAM. For instance, a laptop that requires DDR4 RAM can only support DDR4 RAM. Each type of RAM has different pin sizes and notch locations meaning a DDR3 RAM module will only fit into a DDR3 RAM slot and so on. Refer to your system’s manual to determine the supported RAM specifications Along with RAM types, there are also different Form Factors or physical sizes of RAM. SODIMM (or SO-DIMM) RAM is used in laptops and notebooks and is also commonly used in select All-in-One (AIO) computers, Mini PCs and NAS systems. DIMM RAM is used in Desktops Computers as well as Workstations and Servers. The two sizes are not interchangeable; a DIMM module will not fit into a system that requires SODIMM RAM and a SODIMM module will not fit into a system that requires DIMM RAM. Non-ECC Unbuffered (or simply Non-ECC): Primarily used in Desktop PCs, Laptops, All-in-One (AIO) computers, & Mini PCs as almost all those system types only support Non-ECC Unbuffered memory ECC Registered: Only used in Servers and select Workstations ECC Load Reduced: Only used in Servers and select Workstations ECC Unbuffered: Only used in Servers and Workstations ECC Fully Buffered: Only used in select Servers that support DDR2 RAM Different ECC types cannot be mixed within the same system, only one type can be used.

Brand: A-Tech


Computer Memory Size: 16 GB


RAM Memory Technology: DDR4


Memory Speed: 2666 MHz


Compatible Devices: Desktop, Workstation


RAM Memory Technology: DDR4


Memory Speed: 2666 MHz


Compatible Devices: Desktop, Workstation


Additional Features: Lightweight


Voltage: 1.2 volts


Column Address Strobe Latency: 19


Form Factor: DIMM


Data Transfer Rate: 21300 megabytes_per_second


Number of Pins: 288


Memory Form Factor: UDIMM


Memory Generation: DDR4


RAM Size: 16 GB


Brand: A-Tech


Model Name: A-Tech


Number of Items: 2


Manufacturer: A-Tech Components


Unit Count: 2 Count


Model Number: AT8G2D4D2666NA0N12V


Mfr Part Number: AT8G2D4D2666NA0N12V


Warranty Description: Limited Lifetime Warranty Covering Defects In Materials And Workmanship


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Oct 12

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • Works as it Should--easy install
Size: 16GB Kit (2 x 8GB)
Price is competitive but more importantly it's a quality product and it works. I had 16GB on my Dell XPS 8930. After doing my research I decided on A-tech brand to increase RAM to 32GB because of favorable reviews. I was hesitant to buy a less expensive brand--glad that I decide on A-tech. I purchase 2x8GB through Amazon. I also reviewed youtube videos on how to install them. Here's what's unique: Alexa guided me through the purchase and confirmed that the memory I purchased would fit my computer. So I purchased it. I installed memory on unoccupied slot, closed the cover, turned on the computer--presto! 32GB shown on properties! Yea! Tip: Be sure that manufacturer's label faces toward fan when inserting memory sticks. Good job Alexa, Amazon, and A-tech! ... show more
Reviewed in the United States on July 26, 2026 by Nemar

  • A-Tech 16GB (2x8GB) Saved My Thrashing Computer
Size: 16GB Kit (2 x 8GB)
The new memory works great! Copilot told me that going from 12 GB of memory to 16 GB would improve the speed by 20% to 40%. It wasn't wrong. It's at least 40% better than it was. I am much happier with my setup now, and I saved about $100, because I didn’t purchase 32GB. I told Copilot how I use my computer, and it suggested that spending twice the amount of money to get 32 GB would be overkill. My computer started thrashing, when I upgraded to Windows 11, which uses and idles around 7 GB of RAM, where as Windows 10 uses around only 3 or 4 GB. Upgrading to Windows 11 caused the system to thrash, create a bottleneck, because of Windows 11’s need for more RAM. My computer was using 8 GB in dual-channel mode and 4 GB in single, because I had only 12GB. Now, I have 16 GB in full dual-channel mode, and it's much faster even though there is only 4 GB more RAM. So, if your computer was doing great for your purposes, with only 12 GB of RAM, before you upgraded to Windows 11, you might be satisfied with 16GB. I have a Dell Inspiron 3880, and this RAM works great with it! Just check your RAM specs with your computer manufacturer. It works with other computers, too. I have a tremor in my wrist, and I managed to install the memory anyway. I should also mention that I typically keep two or three browsers open, using around 45 tabs; LibreOffice with a single word document; also Windows Media Player, Copilot; and Thunderbird Mail and that's about it. I don’t use my computer for gaming. Task Manager says that I am consuming on average between 75% to 90% of my RAM regularly, but it is fine at that load. Running in dual-channel mode is the difference. So, you might not need a new computer yet, if you just upgraded to Windows 11 and noticed that your computer slowed down a lot. To run in dual channel mode you need two memory modules with the same specs. ... show more
Reviewed in the United States on February 20, 2026 by Glenn A Lavoie

  • Great product for the $
Size: 16GB Kit (2 x 8GB)
Excellent product. I could not use my desktop computer due to a RAM problem. Purchased this, installed it and my computer works fine.
Reviewed in the United States on March 21, 2026 by Linda C.

  • MY PC no longer runs low on memory
Size: 16GB Kit (2 x 8GB)
Got 16GB memory to add to the 16GB already installed on my desktop PC. I was sometimes running low on memory while running multiple programs simultaneously, so wanted to add memory to eliminate the issue. The new memory was relatively easy to install once I was able to get access to the inside of the PC. After installation the PC recognized the new memory and reported that I now had 32 GB of installed memory. The extra memory did indeed address the issue, I no longer run low on memory even with multiple programs running concurrently. Very happy! ... show more
Reviewed in the United States on July 3, 2026 by Amazon Customer

  • RAM
Size: 16GB Kit (2 x 8GB)
Great stuff
Reviewed in the United States on April 16, 2026 by Jay Richter

  • Always plugs the memory gap
Size: 16GB Kit (2 x 8GB)
A-Tech memory does what it says on the tin. This budget brand has long been a reliable gap filler when you just need a machine to keep working. Good stuff. It's sad to pay the same price today for 16gb of DDR4 2666 mhz that I paid last year for 32gb of premium DDR5 CL30 6000 MT/s. For that reason I'm deducting one star and this entire industry can bite my shiny metal exhaust port. ... show more
Reviewed in the United States on July 7, 2026 by Amazon Customer

  • Worked fine, no issues.
Size: 16GB Kit (2 x 8GB)
Worded great in a new computer system.
Reviewed in the United States on August 27, 2026 by J. Bryan

  • Worth the Purchase
Size: 16GB Kit (2 x 8GB)
Works great, amazing quality, no issues here, works as intended
Reviewed in the United States on February 3, 2026 by German

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