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Green rectangular circuit board with gold contacts and black memory chips

Crucial

Crucial CT8G3S1339M 8GB DDR3 1333 SO-DIMM 204-pin memory upgrade

SKU CH-CAS9-M01X6 MPN CT8G3S1339M

8GB DDR3 1333 SO-DIMM for Apple notebooks, 204-pin CL9 module tested to meet Mac quality requirements

  • Total capacity8 GB
  • Rated speedDDR3 1333 (PC3 10600)
  • CAS latency9
  • Rated voltage1.35 V/1.5 V
  • Product type204-Pin DDR3 SO-DIMM
  • Compatible withFor Apple Notebook
  • 8GB capacity lets you run more apps smoothly
  • DDR3 1333 speed matches Apple's original specification
  • Dual 1.35V/1.5V voltage works with a wider range of Mac notebooks
  • 204-pin SO-DIMM form factor fits standard Apple memory slots
  • Every module tested at component and module level for reliability

Mac notebook memory upgrade

This Crucial CT8G3S1339M module adds 8GB of DDR3 memory to compatible Apple notebooks. It runs at 1333 MT/s with a CAS latency of 9 and operates at 1.35V or 1.5V. The 204-pin SO-DIMM form factor fits the memory slots used in these specific Mac systems.

Fits Apple notebook slots

The module installs directly into a 204-pin SO-DIMM socket inside the notebook. No additional cables, brackets or power connections are required. Adding this memory frees the system from relying on slower storage for virtual memory during multitasking.

Suits owners of compatible Macs

This upgrade suits Mac users whose notebooks accept DDR3 1333 SO-DIMMs and have an available slot. Buyers who need a different memory generation, a higher speed grade, or a DIMM form factor for a desktop should look elsewhere.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $32.99
Cheaper than about 84% of the 21,161 comparable items (median $397.99).
Total capacity 8 GB
Lower than about 80% of the 20,941 comparable items (median 32 GB).
CAS latency 9
Lower than about 92% of the 483 comparable items (median 22).
Price per GB $4.12 per GB
Cheaper than about 84% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameCrucial
Model nameCT8G3S1339M
Total capacity8 GB
Product type204-Pin DDR3 SO-DIMM
Performance
Rated speedDDR3 1333 (PC3 10600)
Memory
CAS latency9
Power
Rated voltage1.35 V/1.5 V
Size & build
Shipping weight0.05 kg
Package size168 × 117 × 10 mm
Compatibility
Compatible withFor Apple Notebook

Questions about this item

Does the 1.35V operating voltage limit heat output during all-day use?

The module runs at 1.35V or 1.5V, so power draw and heat stay low even under continuous load.

Will the CL9 latency at 1333 MT/s create a bottleneck in sustained workloads?

CL9 at 1333 MT/s is the rated timing; the limit you hit first is the bus speed itself, not the latency.

Does my Mac need a 204-pin DDR3 slot to accept this module?

Yes — it is a 204-pin DDR3 SO-DIMM built for Apple notebooks that use DDR3 memory.

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