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Crucial

Crucial CT51264AC800 4GB DDR2 800MHz SODIMM Laptop Memory

★★★★★4.3 (205 reviews)

Give an aging DDR2 laptop a meaningful speed boost with 4GB of 800MHz memory at the platform's maximum bandwidth.

$74.89*
✓ In Stock on Amazon.com
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*Price sourced from Amazon.com. Last updated:Jul 21, 2026.Price and availability are subject to change.

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Overview

The Crucial CT51264AC800 is a 4GB DDR2-800 SODIMM — a 200-pin laptop memory module operating at 800MHz with CL6 latency. In DDR2 terms, this is top-tier: 800MHz is the highest standard DDR2 speed, delivering a theoretical peak bandwidth of 6.4 GB/s per channel. For laptops that shipped during the Core 2 Duo era with 1 or 2GB of RAM, jumping to 4GB (or 8GB with two modules) transforms the system from barely adequate under modern browsing workloads to genuinely usable for everyday tasks.

This module is built for users keeping older ThinkPads, MacBooks (pre-2009), and other DDR2-era notebooks in service — whether for a dedicated purpose like a network appliance, a lightweight Linux workstation, or simply extending the useful life of functional hardware. Crucial's compatibility database is one of the most reliable in the industry for legacy platforms, and the lifetime warranty provides long-term assurance. Installation is the standard SODIMM procedure: open the memory bay, seat the module at an angle, and press down until the clips engage. No BIOS configuration required on supported systems.

Key Features

Single Module

Specifications

Brand
Crucial
Model
CT51264AC800
Capacity
4GB
Memory Type
DDR2
Speed
800MHz (PC2-6400)
Form Factor
200-Pin SODIMM
CAS Latency
CL6
Module Count
Single Module

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Frequently Asked Questions

This is a 200-pin DDR2 SODIMM running at 800MHz (PC2-6400). It fits any laptop with a DDR2 SODIMM slot that supports 800MHz or lower speeds. Most Intel Core 2 Duo-era notebooks from 2007–2010 qualify, but check your system's maximum supported RAM per slot — some older chipsets cap at 2GB per DIMM.
Yes. DDR2-800 is backward compatible with DDR2-667 (PC2-5300) slots. The module will downclock to 667MHz to match the memory controller. You won't get 800MHz speeds, but it will function correctly.
Technically yes — DDR2 does not require matched pairs to function. However, you'll lose dual-channel mode on systems that support it, which reduces memory bandwidth. For best performance, use two identical modules.
CL6 is the standard latency rating for DDR2-800. Lower latencies like CL5 exist but are rare and more expensive at this speed. CL6 at 800MHz delivers effective latency of 15 nanoseconds, which is typical and adequate for DDR2-era platforms.

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