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A-Tech 2GB DDR2 800MHz UDIMM PC2-6400 CL6 1.8V DIMM Non-ECC Unbuffered Desktop RAM Memory Module

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4.6 2,601 ratings

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Size: (2GB x 1) | 2GB Stick

Color: DDR2 800MHz (PC2-6400)

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Purchase options and add-ons

Brand	A-Tech
Computer Memory Size	2 GB
RAM Memory Technology	DDR2
Memory Speed	800 MHz
Compatible Devices	Desktop

About this item

Memory RAM Compatible for select DDR2 capable Desktop, PC 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 2GB RAM Module | DDR2 DIMM 240-Pin
Speeds up to 800MHz, PC2-6400
NON-ECC Unbuffered ( UDIMM ) | 1Rx8 or 2Rx8 - Single or Dual Rank | JEDEC DDR2 standard 1.8V

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A-Tech 2GB DDR2 800MHz UDIMM PC2-6400 CL6 1.8V DIMM Non-ECC Unbuffered Desktop RAM Memory Module

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Intel Core 2 Duo E8400 3GHz Dual-Core (EU80570PJ0806M) Processor Only

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	This Item A-Tech 2GB DDR2 800MHz UDIMM PC2-6400 CL6 1.8V DIMM Non-ECC Unbuffered Desktop RAM Memory Module	Recommendations PC2 6400 DDR2 800MHz UDIMM RAM 8GB Kit (2GBX4) 2Rx8 PC2 6400U 2GB 1.8V Non-ecc Unbuffered Desktop Memory	dummy DATO 16GB DDR4 3200MHz PC4-25600 CL22 1.2V 288-Pin Non-ECC UDIMM Desktop RAM Memory Module	dummy ASHATA DDR Memory,PC-2700 Desktop PC DDR 333MHz Memory Fast 1GB RAM 184Pin Memory Module,for AMD Motherboard	dummy Tonysa DDR2 4GB Large Capacity Memory RAM 240PIN PC2-5300 667MHz High Frequency Memory Module for Desktop Computer	dummy 4GB 800MHz DDR2, 4GB Large Capacity DDR2 Memory Module 800MHz Fast Data Transmission RAM 240 Pin DDR2 4GB for AMD
	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart
Price	$13.99	$18.89	$29.99	$12.79	$15.99	-17% $14.06 Typical: $16.98
Delivery	Get it as soon as Saturday, May 4	Get it as soon as Saturday, May 4	Get it as soon as Saturday, May 4	Get it May 15 - 30	Get it as soon as Saturday, May 4	Get it May 9 - 23
Customer Ratings	4.62,601	4.6397	4.479	4.119	3.95	5.02
Sold By	A-Tech Components	Motoeagle-US	DATOTEK	Richer-R	Jieweit	Eugee
computer memory size	2 GB	2 GB	16 GB	1 GB	4 GB	4 GB
memory speed	800 MHz	800 MHz	3200 MHz	333 MHz	667 MHz	800 MHz
RAM tech	DDR2	DDR2	DDR4 UDIMM 3200MHz	DDR	DDR2	DDR2
number of items	1	4	1	1	—	2
data transfer rate	6400 megabytes per second	800 MHz	3200 MHz	333 MHz	667 MHz	800 MHz
number of pins	240	240	288	184	240	240
compatible devices	Desktop	Desktop	PC, Desktop	Desktop	Desktop	—
form factor	240-Pin	240-pin UDIMM	DDR4 UDIMM	DIMM	DIMM	DIMM
voltage	1.8 volts	1.8 volts	1.2 volts	2.5 volts	1.8 volts	1.8 volts

From the brand

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).
What does a memory (RAM) upgrade do?

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.
Browse our A-Tech Store

Visit the Store
What are the different types of memory (RAM)?

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
What is SODIMM and DIMM, which do I need?

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.
What ECC type memory (RAM) do I need?

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.

Looking for specific info?

Product Description

A-Tech The Experts in RAM Memory upgrades

DDR2 DIMM ram for desktop Boost performance

DDR2 DIMM RAM for desktops endure reliability

Multitask with ease, take on more by expanding your computers ability to handle greater workloads

Product information

Technical Details

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Summary

RAM

‎2 GB DDR2

Memory Speed

‎800 MHz

Other Technical Details

Brand

‎A-Tech

Item model number

‎CT25664AA800

Hardware Platform

‎PC

Item Weight

‎0.353 ounces

Product Dimensions

‎6.6 x 2.15 x 0.3 inches

Item Dimensions LxWxH

‎6.6 x 2.15 x 0.3 inches

Color

‎DDR2 800MHz (PC2-6400)

Computer Memory Type

‎DDR2 SDRAM

Voltage

‎1.8 Volts

Manufacturer

‎A-Tech Components

ASIN

‎B00C537LWA

Country of Origin

‎USA

Is Discontinued By Manufacturer

‎No

Date First Available

‎May 22, 2013

Additional Information

Customer Reviews

4.6 2,601 ratings

4.6 out of 5 stars

Best Sellers Rank

#3,962 in Computer Memory

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.

Product Warranty: For warranty information about this product, please click here

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Customer reviews

4.6 out of 5

2,601 global ratings

How customer reviews and ratings work

Customers say

Customers like the quality, ease of installation, performance, and value of the internal memory. For example, they mention it's the best non-gaming memory, it'll recognize immediately, and that it works perfectly. That said, they say it'd be a good value for the cost.

AI-generated from the text of customer reviews

847 customers mention778 positive69 negative

Customers are satisfied with the performance of the memory. They mention that it works perfectly, enhances the performance, and is easy to install. Some say that the memory works great on older computer systems and that the instructions are clear.

"...installed on the ReadyNAS (just very tight space) but they work perfectly once installed. Have bought several sets. Will buy again of need arises." Read more

"...without a hitch, fit perfectly in the slots in the computer, and worked flawlessly as well as passing the startup diagnostic tests when I ran them...." Read more

"...is an excellent product, I got two 4GB kits (4 modules), and all four worked just great, fully compatible with both Intel based computers where they..." Read more

"Nice packaging and works well with the PC not a single problem to install" Read more

333 customers mention325 positive8 negative

Customers are satisfied with the value of the internal memory. They mention that it is a low cost upgrade and an excellent transaction.

"...where they were installed, I feel these memory modules are an excellent value, and revived a pair of 8+ year old computers, one of the computers is..." Read more

"...Good ram at a fair price and quick delivery. I can recommend this product." Read more

"...Since they're so inexpensive and the PC is running fine, I'm not going to return them...." Read more

"...Great price and great performance. I'm one happy pappy!" Read more

269 customers mention197 positive72 negative

Customers like the quality of the memory. They mention that it's great, easy to install, and works great. The increased memory makes a big difference, and the modules are a great solution if you need a memory upgrade at a good price.

"...old NAS boxes, but with a memory upgrade they are still hugely capable as backup devices...." Read more

"...It has been about two months now and the memory is still working great, with the computer being used over 4 hours a day...." Read more

"...purchased a refurbished computer from Amazon and shortly thereafter, it quit...." Read more

"...With Genuine A-Tech Brand memory, the memory size is PERFECT!!!..." Read more

153 customers mention153 positive0 negative

Customers find the installation process of the memory to be easy. They mention that the instructions are clear and easy to understand. The memory fits perfectly in the slots in the computer and is recognized immediately with no hassles.

"...The memory installed without a hitch, fit perfectly in the slots in the computer, and worked flawlessly as well as passing the startup diagnostic..." Read more

"...It came with 4GB, and I brought it up to 8GB. Three of the chips were quite easy to install...." Read more

"Installed easily and works great!-..." Read more

"...BIOS knew exactly what it was dealing with and configured itself correctly...." Read more

33 customers mention27 positive6 negative

Customers like the fit of the memory. They say it fits very well, is easy to install, and is compatible with other brand and speed modules. Some customers also mention that the memory clicks and locks into place perfectly. Overall, most are satisfied with the fit and compatibility of the product.

"...The memory installed without a hitch, fit perfectly in the slots in the computer, and worked flawlessly as well as passing the startup diagnostic..." Read more

"...They clicked and locked into place perfectly and had no noticeable wiggle in the memory slots...." Read more

"...With Genuine A-Tech Brand memory, the memory size is snug and tight, but NOT TOO TIGHT...." Read more

"...Booted right up; no compatibility or stability issues with AMD motherboard's automatic setting...." Read more

36 customers mention15 positive21 negative

Customers are mixed about the bootability of the internal memory. Some mention that it boots right up, while others say that it wouldn't start up.

"...both A-Data sticks the computer gave a 3 pulse warning beep and would not boot...." Read more

"...The pc booted up right away without issues...." Read more

"...Not perfectly though -- once in awhile it won't boot right and I'll need to reboot...." Read more

"...sporting fancy heatspreaders or LED lights, chunked right in and booted right up...." Read more

25 customers mention11 positive14 negative

Customers are mixed about the compatibility of the memory. Some mention that it works well and has no compatibility problems, while others say that it's not compatible with their existing RAM or 3 other brands. Some say that the memory is mismatched and does not seem to be compatible with the 750i xfx motherboard.

"...So, I checked the memory and found there were three different types of memory installed. Memory is all supposed to be matched...." Read more

"...kits (4 modules), and all four worked just great, fully compatible with both Intel based computers where they were installed, I feel these memory..." Read more

"...I got what I was suppose to get however they was two different type of memory modules...." Read more

"...With Genuine A-Tech Brand memory, NO COMPATIBILITY PROBLEMS...." Read more

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Valenti

Perfect every time. Ideal upgrade for ReadyNAS Pro 6/Ultra units.

Reviewed in the United States on January 28, 2024

Size: (2GB x 2) | 4GB KitColor: DDR2 800MHz (PC2-6400)Verified Purchase

For the price, these are amazing. I use these to update my ReadyNAS Pro/Ultra 6 units. They are old NAS boxes, but with a memory upgrade they are still hugely capable as backup devices. Extra memory is a welcome addition and at this price a no-brainer upgrade. It IS a little of a pain in the bu** to get them installed on the ReadyNAS (just very tight space) but they work perfectly once installed. Have bought several sets. Will buy again of need arises.

Helpful

Tom

Installed and Up and Running in Minutes - Worked Flawlessly

Reviewed in the United States on July 22, 2023

Size: (2GB x 2) | 4GB KitColor: DDR2 800MHz (PC2-6400)Verified Purchase

When I began to randomly get the dreaded "blue screen" I tested my old Optiplex 760's memory at startup by pressing the F12 key and, sure enough, there was a memory problem. Rummaging around on the web I found a description of the memory in this machine and did a search on Amazon. A huge number of choices came up but I picked this one based on the reviews about the reliability of the company and the support. It came a day early, was packaged professionally and the information on the package and the leaflet was obviously written by someone who was both knowledgable and proficient in English -- something that is becoming increasingly rare these days when instructions are often incomprehensibly written by a person struggling with a second language. There was a little card enclosed with installation hints, troubleshooting tips, a support number, and a believable promise of satisfaction. The memory installed without a hitch, fit perfectly in the slots in the computer, and worked flawlessly as well as passing the startup diagnostic tests when I ran them. I'll use A-Tech again!

One person found this helpful

Helpful

Highly compatible DDR2 RAM Modules, can handle both 800 MHz PC-6400 and 667 MHz PC-5300 excellent value!

Reviewed in the United States on January 31, 2016

Size: (2GB x 2) | 4GB KitColor: DDR2 800MHz (PC2-6400)Verified Purchase

This is an excellent product, I got two 4GB kits (4 modules), and all four worked just great, fully compatible with both Intel based computers where they were installed, I feel these memory modules are an excellent value, and revived a pair of 8+ year old computers, one of the computers is an Asrock G31M-GS based system, the other an Elitegroup 945GCT-M/1333 v3.0 with max RAM specs of 4GB (2 GB per slot) DDR2 667 MHz PC-5300, but I took a chance with these RAMs and they adjusted perfectly from 800 MHz down to 667 MHz (not all RAM modules can do this), in other words these modules can handle both 800 MHz PC-6400 and 667 MHz PC-5300. I would definitely like to try A-Tech's other RAM modules like DDR3 in the near future.
It must be noted that (at least the ones I got), these RAMs can not handle the 533 MHz PC-4200 standard, this was not a problem for me, but if your motherboard/system is of an older type that can only accept this standard, then these modules won't work for you.
Bottom line is that if your system/motherboard can handle 240-pin DIMM (Desktop PC), non ECC, DDR2, PC-6400 (800 MHz) or PC-5300 (667 MHz) RAM, then I would say there is a 99% chance these modules will be compatible with it.
Tip, if for example you plan to get 4 GB of RAM,, get a kit (2 modules of 2 GB each), vs getting a single 4 GB stick, when you get a kit (two identical modules) you can benefit from dual channel, that way you can get a full 800 MHz speed vs just 400 MHz from a PC-6400 DDR2 when you use a single or an odd number of RAM sticks.

3 people found this helpful

Helpful

EJVF

Good

Reviewed in the United States on March 22, 2024

Size: (2GB x 2) | 4GB KitColor: DDR2 800MHz (PC2-6400)Verified Purchase

Nice packaging and works well with the PC not a single problem to install

Helpful

RAM helped us recover photos we thought were lost

Reviewed in the United States on April 12, 2022

Size: (2GB x 2) | 4GB KitColor: DDR2 667MHz (PC2-5300)Verified Purchase

From tears to cheers. My in-law's "vintage" desktop started acting up last year. Booting up intermittently or freezing up in the middle of a task. Turns out the backup tasks quit running years ago.

It wasn't easy finding ram for this "vintage" pc at a decent price. Very glad I found these.

Ordered these sticks and had them delivered to my wife's parent's place in HI on our last visit. The pc booted up right away without issues. As soon as I could I copied "My Documents" and all important files to their OneDrive cloud storage.

There were hundreds of family photos that dated back to 2009 that weren't backed up anywhere. We continued to use this desktop for the couple of weeks we were there without any hiccups.

Good ram at a fair price and quick delivery. I can recommend this product.

Helpful

Ethan Wilkerson

Performance

Reviewed in the United States on February 16, 2024

Size: (4GB x 2) | 8GB KitColor: DDR2 800MHz (PC2-6400)Verified Purchase

Greatly enhanced the performance of my 20 year old computer. Little pricey, though...

Helpful

MLO

Cheap and Good

Reviewed in the United States on August 1, 2018

Size: (2GB x 2) | 4GB KitColor: DDR2 800MHz (PC2-6400)Verified Purchase

Had an old computer I had built for my grandson from spare part awhile back. It was an old Asus P2B Deluxe motherboard with a CoreDuo Intel processor. Ah the good old days! Recently computer failed to post and discovered it was a bad stick of RAM. I had 4 sticks in at the time, 2 2 gig sticks and 2 1 gig sticks for 6 GB total (in Windows 10 Pro x64). Took out both 1 GB sticks. Didn't want to settle for just 4 GB of memory so got these. Popped them in, computer booted right up. Now I have 8 GB total for my grandson to mess around with. 8 is definitely better than 4. What's cool is these were PC6400 and the 2 sticks already in were PC8400. Computer didn't seem to mind as I changed nothing in the BIOS and computer didn't even blink. So far so good. I remember looking for memory many moons ago and DDR2 was way more expensive when I looked than it is now. I was pleasantly surprised as I didn't want to spend much on an already obsolete computer. Breathed a little more life in this old dog.

4 people found this helpful

Helpful

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Amado Alejandro Nivon Farrera

Buen producto

Reviewed in Mexico on April 21, 2020

Size: (2GB x 2) | 4GB KitColor: DDR2 800MHz (PC2-6400)Verified Purchase

Cumplió con los expectativas

One person found this helpful

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A-Tech 2GB DDR2 800MHz UDIMM PC2-6400 CL6 1.8V DIMM Non-ECC Unbuffered Desktop RAM Memory Module

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From the brand

What does a memory (RAM) upgrade do?

Browse our A-Tech Store

What are the different types of memory (RAM)?

What is SODIMM and DIMM, which do I need?

What ECC type memory (RAM) do I need?

Looking for specific info?

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A-Tech 2GB DDR2 800MHz UDIMM PC2-6400 CL6 1.8V DIMM Non-ECC Unbuffered Desktop RAM Memory Module

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What does a memory (RAM) upgrade do?

Browse our A-Tech Store

What are the different types of memory (RAM)?

What is SODIMM and DIMM, which do I need?

What ECC type memory (RAM) do I need?

Looking for specific info?

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