Micron

Crucial Technology CT25664AA800 2 GB 240-pin DIMM DDR2 PC2-6400 Memory Module

Name: Crucial Technology CT25664AA800 2 GB 240-pin DIMM DDR2 PC2-6400 Memory Module
Brand: Micron
SKU: B001196H3S
Price: 19.98 USD
Availability: InStock

Bottom line: The Crucial Technology 2 GB 240-pin DIMM DDR2 PC2-6400 Memory Module ($19.98 on Amazon as of 2026-10-06): DDR2-800 (PC2-6400) speed for peak bandwidth on Socket 775-era boards; main trade-off: obsolete DDR2 form factor won't fit DDR3, DDR4, or DDR5 slots.

$19.98

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🛒 See live eBay price Also on Amazon — $19.98 Compare to similar memory & ram

By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-06

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. About the author →

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

Pros & Cons

Pros

✓ DDR2-800 (PC2-6400) speed for peak bandwidth on Socket 775-era boards
✓ 2GB single DIMM fills one slot, leaves room to reach 4GB dual-channel
✓ 1.8V 256Meg x 64 module runs at standard DDR2 desktop voltage
✓ Micron-manufactured DRAM, the same silicon behind the Crucial name

Cons

✗ Obsolete DDR2 form factor won't fit DDR3, DDR4, or DDR5 slots
✗ 2GB per stick is modest; heavy multitasking wants 4GB+ total
✗ 800MHz is DDR2's ceiling, far slower than any DDR3-era kit
✗ 240-pin desktop DIMM only, not compatible with laptop SO-DIMM slots

Manufacturer description

Every day, you rely on your computer to make your life easier. A Crucial DRAM upgrade can help your system run faster, and it's one of the easiest, most affordable ways to improve system performance. Reap the benefits doing everything from everyday system tasks to mission-critical applications. For over 12 years, Crucial has been recognized as a leader in DRAM upgrades. Our products help people achieve greater system performance through improved productivity, reliability, and speed. As part of one of the world’s largest DRAM manufacturers—Micron Technology—our long tenure of engineering and…

SpecPicks Verdict

SpecPicks scored Crucial Technology 2 GB 240-pin DIMM DDR2 PC2-6400 Memory Module using a rating × review-volume × price-fit model applied to published specs and reviews across the memory & ram category. Micron'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.

Key Features

2 GB DIMM: 1.8V 256Meg x 64 PC Memory
Technology - DDR2 SDRAM
Form Factor - 240-pin DIMM
Form Factor -- 240-pin DIMM
Memory Speed -- 800MHz DDR2-800/PC2-6400

Full Specifications

Brand	Micron
Voltage	1.8 Volts
RAM Size	2 GB
2 GB DIMM	1.8V 256Meg x 64 PC Memory
Model Name	2GB 240-PIN DDR2 PC2-6400 MEMORY MODULE
Unit Count	1.0 Count
Form Factor	DIMM
Memory Speed	800 MHz
Model Number	CT25664AA800
Compatibility	PC
Number of Pins	240
Mfr Part Number	CT25664AA800
Item Part Number	CT25664AA800
Memory Generation	DDR2
Compatible Devices	Desktop
Data Transfer Rate	800 MHz
Memory Form Factor	DIMM
Additional Features	Lightweight
Computer Memory Size	2 GB
Warranty Description	Limited lifetime warranty

Ready to buy?

Crucial Technology CT25664AA800 2 GB 240-pin DIMM DDR2 PC2-6400 Memory Module 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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*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.