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Crucial CT51272AQ667 4GB DDR2 PC2-5300 ECC Memory — main product image
Crucial

Crucial CT51272AQ667 4GB DDR2 PC2-5300 ECC Memory

Reliable 4GB DDR2 ECC memory module engineered for server and workstation data integrity.

$32.99*
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*Price sourced from Amazon.com. Last updated:Jun 04, 2026.Price and availability are subject to change.

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Overview

The Crucial CT51272AQ667 is a 4GB DDR2 fully buffered ECC DIMM built for server and workstation environments where data integrity is non-negotiable. Operating at PC2-5300 (DDR2-667) speeds, this 240-pin module uses Error-Correcting Code technology to automatically detect and correct single-bit memory errors, reducing the risk of data corruption and unexpected system crashes in always-on environments.

As a fully buffered DIMM, this module uses an Advanced Memory Buffer chip to improve signal integrity and allow higher memory capacities per channel. This makes it a solid choice for extending the life of compatible legacy servers and workstations that rely on DDR2 FB-DIMM architecture. Crucial's rigorous testing and quality control ensure dependable operation, backed by the brand's long-standing reputation in the memory market.

Specifications

Brand
Crucial
Model
CT51272AQ667
Capacity
4 GB
Memory Type
DDR2
Form Factor
240-pin DIMM
Speed
PC2-5300 (DDR2-667)
Error Correction
Fully Buffered ECC
Voltage
1.5V

Pros & Cons

👍 Pros

  • ECC error correction provides superior data integrity for server environments.
  • 4GB capacity in a single DIMM helps consolidate memory slots.
  • DDR2-667 speed is well-suited for compatible legacy server platforms.
  • Crucial brand is known for reliable, tested memory modules.

👎 Cons

  • DDR2 technology is outdated and incompatible with modern DDR3/DDR4/DDR5 systems.
  • Fully buffered DIMMs run warmer than standard or registered ECC modules.
  • 4GB capacity is limited for modern server workloads.
  • Only compatible with motherboards that specifically support FB-DIMMs.

Frequently Asked Questions

This module is designed for server and workstation motherboards that support 240-pin fully buffered DDR2 ECC DIMMs running at PC2-5300 speeds.
Fully buffered ECC (Error-Correcting Code) means the module uses an advanced memory buffer and can detect and correct single-bit memory errors automatically, improving data reliability in mission-critical environments.
No. Fully buffered ECC DIMMs require compatible server or workstation motherboards. Standard desktop motherboards do not support this memory type.
It runs at DDR2-667 speed, also known as PC2-5300, providing a data transfer rate of 5300 MB/s.

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