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A-Tech 4GB (2x2GB) DDR2 800MHz UDIMM PC2-6400 CL6 1.8V DIMM Non-ECC Unbuffered Desktop RAM Memory Modules
A-Tech

A-Tech 4GB (2x2GB) DDR2 800MHz UDIMM PC2-6400 CL6 1.8V DIMM Non-ECC Unbuffered Desktop RAM Memory Modules

Bottom line: The A-Tech 4GB (2x2GB) DDR2 800MHz UDIMM PC2-6400 CL6 1.8V DIMM Non-ECC: Matched 2x2GB pair avoids mixing mismatched salvaged sticks; main trade-off: rank is listed as 1Rx8 or 2Rx8, so you cannot guarantee which you get.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

Pros & Cons

Pros

  • ✓ Matched 2x2GB pair avoids mixing mismatched salvaged sticks
  • ✓ A-Tech Lifetime Warranty covers the modules, not a 30-day pull guarantee
  • ✓ Full PC2-6400 800MHz speed, the top JEDEC DDR2 desktop grade
  • ✓ Standard 1.8V JEDEC spec, no BIOS voltage tweaking needed

Cons

  • ✗ Rank is listed as 1Rx8 or 2Rx8, so you cannot guarantee which you get
  • ✗ Non-ECC and unbuffered, so it will not work in ECC servers
  • ✗ 4GB total caps what 32-bit era systems can actually address
  • ✗ 240-pin DDR2 fits DDR2 boards only, never DDR3 or DDR sockets

Manufacturer description

The A-Tech 4GB DDR2 kit is a two-module 2x2GB set built for aging desktops that still run on 240-pin DDR2 DIMM slots. Each module runs at 800MHz (PC2-6400) on the JEDEC-standard 1.8V DDR2 spec, unbuffered and non-ECC, in 1Rx8 or 2Rx8 single- or dual-rank configurations depending on the module you receive. If you are reviving a Core 2 Duo tower, an early retro gaming build, or a legacy workstation that still boots but chokes on browser tabs, doubling to 4GB is the cheapest way to stop the swap-file thrashing. A-Tech positions this kit as a straightforward drop-in: pop the clips, seat both…

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SpecPicks Verdict

SpecPicks scored A-Tech 4GB (2x2GB) DDR2 800MHz UDIMM PC2-6400 CL6 1.8V DIMM Non-ECC… 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 DDR2 RAM work in my computer?

It fits desktop PCs with 240-pin DDR2 DIMM slots that accept non-ECC unbuffered memory at 1.8V. DDR2 is not backward or forward compatible with DDR or DDR3 slots, so confirm your motherboard manual lists DDR2 before ordering. A-Tech's tech support team can help check compatibility before purchase.

Is this a matched pair for dual-channel?

Yes. The kit ships as 4GB total in 2 x 2GB modules, so you get a matched pair from the same production run rather than two separately sourced sticks. Populate the two same-color slots on your motherboard to enable dual-channel mode.

What warranty comes with these modules?

A-Tech backs the kit with its Lifetime Warranty and offers tech support both before and after purchase. Check the product listing for the current claim process and any regional terms.

Will it run slower if my board only supports 667MHz?

These modules are rated for speeds up to 800MHz (PC2-6400). On a board that tops out lower, DDR2 memory typically downclocks to the board's supported speed rather than failing to post. Consult your motherboard documentation for its supported DDR2 speeds.

How do these compare to used DDR2 sticks from eBay?

This is a current-production kit with a lifetime warranty, whereas salvaged pulls carry unknown hours and usually no warranty. The tradeoff is that you are paying a premium over used stock for new modules and support coverage.

Key Features

  • 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
  • 4GB RAM Kit ( 2 x 2GB Modules ) | 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

Full Specifications

BrandA-Tech
Voltage1.8 Volts
RAM Size4 GB
Model NameFBA_CT2KIT25664AA800
Unit Count2.0 Count
Form Factor240-Pin
Memory Speed800 MHz
Model NumberFBA_CT2KIT25664AA800
CompatibilityPC
Number of Pins240
Mfr Part NumberFBA_CT2KIT25664AA800
Memory GenerationDDR2
Compatible DevicesDesktop
Data Transfer Rate6400 Megabytes Per Second
Memory Form FactorUDIMM
Additional FeaturesLightweight
Computer Memory Size4 GB
Warranty DescriptionLimited Lifetime Warranty Covering Defects In Materials And Workmanship
RAM Memory TechnologyDDR2
Column Address Strobe Latency6

Ready to buy?

A-Tech 4GB (2x2GB) DDR2 800MHz UDIMM PC2-6400 CL6 1.8V DIMM Non-ECC Unbuffered Desktop RAM Memory Modules is vintage hardware; the used and vintage market on eBay carries most of the live inventory. Prices and condition vary by seller and move in real time, so we link the live listing rather than quote a cached price. It also has an Amazon listing — check it for current price and availability. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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A-Tech 4GB (2x2GB) DDR2 800MHz UDIMM PC2-6400 CL6 1.8V DIMM Non-ECC Unbuffered Desktop RAM Memory Modules
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