Crucial

Crucial 2GB Single DDR2 667MHz (PC2-5300) CL5 SODIMM 200-Pin Notebook Memory Module CT25664AC667

Name: Crucial 2GB Single DDR2 667MHz (PC2-5300) CL5 SODIMM 200-Pin Notebook Memory Module CT25664AC667
Brand: Crucial
SKU: B000F7QRTG

Bottom line: The Crucial 2GB Single DDR2 667MHz: 2048MB per stick, the per-slot ceiling on most DDR2 notebooks; main trade-off: single module, so dual-channel needs a second matching stick purchased.

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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 →

Pros & Cons

Pros

✓ 2048MB per stick, the per-slot ceiling on most DDR2 notebooks
✓ DDR2-667 PC2-5300 at CL5, the common spec for Core 2 Duo laptops
✓ Unbuffered, non-ECC signal processing matches consumer notebook controllers
✓ Standard 200-pin SODIMM form factor, no adapter or riser needed

Cons

✗ Single module, so dual-channel needs a second matching stick purchased
✗ 667MHz caps performance if your board supports DDR2-800 SODIMMs
✗ No heatspreader, and DDR2 SODIMMs run warm in thin 2000s chassis
✗ CL5 is looser than CL4 kits some enthusiasts hunt for

Manufacturer description

It runs at 667MHz on the DDR2-667/PC2-5300 standard with CL5 timings and unbuffered signal processing, so it slots into the memory controllers that shipped in Core 2 Duo and late Pentium M era notebooks without needing registered or ECC support. If you are restoring a period-correct laptop or pushing an older machine to its usable ceiling, a single 2048MB module is usually the largest stick those platforms accept per slot. Pair two of them for dual-channel operation on boards that support it. Crucial modules are a common reference point in retro laptop upgrade threads because the DDR2 SODIMM…

SpecPicks Verdict

SpecPicks scored Crucial 2GB Single DDR2 667MHz (PC2-5300) CL5 SODIMM 200-Pin… using a rating × review-volume × price-fit model applied to published specs and reviews across the memory & ram category. Crucial'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 2GB module work in my older laptop?

It fits 200-pin SODIMM slots that accept DDR2-667 (PC2-5300) unbuffered memory, typical of mid-2000s notebooks. Check your laptop's manual or manufacturer memory list to confirm it accepts 2GB per slot.

Is this one stick or a matched pair?

One module. The listing specifies Memory Modules: 1, at 2048MB. You would need to buy a second identical stick to populate both slots for dual-channel operation.

What are the exact speed and timings?

667MHz, DDR2-667/PC2-5300 standard, with CL5 latency and unbuffered signal processing. The part number is CT25664AC667.

Does this module support ECC or registered operation?

No. It is specified as unbuffered signal processing, the standard configuration for consumer notebooks. It is not intended for servers or workstations requiring registered or ECC memory.

What warranty does Crucial offer on this module?

Warranty terms are not listed in the product specifications here. Check the current Amazon product listing or Crucial's support pages for the warranty that applies to this part number.

Key Features

Memory Speed- PC5400; Memory Speed MHz- 667MHz
Memory Category- Laptop; Memory Type- DDR2
Memory Size- 2048MB; Memory Modules- 1; Memory Channels- Dual; Memory Socket- SODIMM;
Memory Category- Laptop; Memory Type- DDR2
Memory Speed- PC5400; Memory Speed MHz- 667MHz
Memory Size- 2048MB; Memory Modules- 1; Memory Channels- Dual; Memory Socket- SODIMM;

Full Specifications

Brand	Crucial
Voltage	1.8 volts
RAM Size	2 GB
Model Name	Crucial
Unit Count	1 Count
Form Factor	SO DIMM 200-pin
Memory Speed	667 MHz
Model Number	CT25664AC667
Number of Pins	200
Mfr Part Number	CT25664AC667
Number of Items	1
Number of Packs	1
Memory Generation	DDR2
Compatible Devices	Laptop
Data Transfer Rate	667 MHz
Memory Form Factor	SODIMM
Additional Features	Lightweight
Computer Memory Size	2 GB
Warranty Description	Limited lifetime warranty
RAM Memory Technology	DDR2

Ready to buy?

Crucial 2GB Single DDR2 667MHz (PC2-5300) CL5 SODIMM 200-Pin Notebook Memory Module CT25664AC667 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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