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Crucial

Crucial CT2K4G3S1339M 8GB DDR3 1333 SODIMM Kit

The Crucial 8GB DDR3 SODIMM Kit delivers a straightforward Mac memory upgrade with two 4GB modules running at 1333 MT/s.

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Overview

The Crucial CT2K4G3S1339M is an 8GB memory upgrade kit consisting of two 4GB DDR3 SODIMM modules rated at 1333 MT/s (PC3-10600) with CL9 latency. Designed specifically for Mac systems, this kit targets the generation of MacBook Pros, iMacs, and Mac minis that shipped with user-upgradeable DDR3 memory slots — generally models from around 2010 to 2012. For these machines, a jump from 2GB or 4GB of factory RAM to 8GB can make a noticeable difference in daily responsiveness, particularly when running multiple applications, working with large files, or keeping many browser tabs open.

The kit supports both 1.35V and 1.5V operation, which provides flexibility across systems that may spec either standard or low-voltage DDR3. Using two matched modules enables dual-channel memory access, which improves bandwidth compared to a single-module configuration. As a Crucial product, the kit is manufactured by Micron — one of the world's largest memory producers — and benefits from Crucial's compatibility testing program. The 204-pin SODIMM form factor is standard for laptops and compact desktops of this era, and installation is typically a straightforward process on Mac models with accessible memory compartments.

Specifications

Brand
Crucial
Model
CT2K4G3S1339M
Capacity
8GB Kit (2 x 4GB)
Memory Type
DDR3
Speed
1333 MT/s (PC3-10600)
Latency
CL9
Form Factor
SODIMM
Pins
204-pin
Voltage
1.35V / 1.5V
Compatibility
Mac Systems

Pros & Cons

👍 Pros

  • 8GB dual-channel kit (2x4GB) provides a meaningful upgrade for older Mac systems with 2GB or 4GB stock configurations
  • Dual-voltage support (1.35V/1.5V) ensures broad compatibility across DDR3 Mac models
  • 204-pin SODIMM form factor matches the standard used in Mac laptops and compact desktops
  • CL9 latency at 1333 MT/s offers reliable performance within DDR3 specifications
  • Crucial brand backed by Micron, a major memory manufacturer

👎 Cons

  • 8GB total capacity may be limiting for heavy multitasking or memory-intensive workflows on supported systems
  • DDR3 1333 MT/s is an older memory standard — only relevant for Mac models from roughly 2010–2012
  • Not compatible with newer Macs that use DDR4, DDR5, or soldered unified memory
  • Kit requires two available SODIMM slots, which means replacing existing modules on systems with only two slots

Frequently Asked Questions

The Crucial CT2K4G3S1339M is designed for Mac systems that support DDR3 1333 MT/s SODIMMs, including various MacBook Pro, iMac, and Mac mini models from the 2010–2012 era. Check Crucial's compatibility tool for your specific model.
The kit includes two 4GB modules for a total of 8GB, installed across two SODIMM slots to enable dual-channel operation.
It supports both 1.35V and 1.5V operation, allowing it to work in systems designed for either standard or low-voltage DDR3.
Based on the specifications, this is a standard non-ECC consumer memory kit intended for Mac desktops and laptops.
Most Mac models that accept SODIMMs allow relatively simple memory installation with basic tools. The specific process varies by model — Apple provides model-specific guides for accessing the memory slots.

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