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Two green 204-pin DDR3 SO-DIMM sticks in a dual-channel kit

Mushkin Enhanced

Mushkin Enhanced 976643A 4GB (2 x 2GB) DDR3 1066 SO-DIMM memory upgrade

SKU CH-994X-EWA6C MPN 976643A

A 4 GB dual-channel DDR3 1066 SO-DIMM kit with CL7 timing for Apple notebooks

  • Total capacity4 GB (2 × 2 GB)
  • Rated speedDDR3 1066 (PC3 8500)
  • CAS latency7
  • Memory timings7-7-7-20
  • Rated voltage1.5 V
  • Kit configurationDual Channel kit
  • 4GB dual-channel kit boosts multitasking headroom for Apple notebooks
  • 1066 MHz DDR3 speed matches PC3-8500 spec for direct compatibility
  • CL7 7-7-7-20 timing delivers low latency response
  • 5 V operation keeps power draw in line with factory modules
  • 204-pin SO-DIMM form factor fits standard Apple memory slots

Apple notebook DDR3 upgrade

This 4 GB kit uses two 2 GB SO-DIMM modules built to the 204-pin DDR3 1066 standard. It is designed for Apple notebooks that accept PC3 8500 memory running at 1.5 V with CL7 timing. The dual-channel configuration helps the memory controller move data more efficiently.

Replaces slower or smaller DDR3 SO-DIMMs

If the notebook currently runs a single module or lower-speed DDR3, this kit restores dual-channel bandwidth and raises the clock to 1066 MHz. The jump is worth it when the system board supports PC3 8500 and the original memory operates at a lower frequency or higher latency.

Suits owners of compatible Apple notebooks needing

Buyers who want more storage or a newer DDR generation should look elsewhere because this product is fixed at DDR3 1066 and 4 GB total capacity. Systems that require 204-pin DDR3 at 1.5 V with 7-7-7-20 timing will install and run without changes.

How it compares

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

Price $13.99
Cheaper than about 94% of the 21,161 comparable items (median $397.99).
Total capacity 4 GB (2 × 2 GB)
Lower than about 90% of the 20,941 comparable items (median 32 GB).
CAS latency 7
Lower than about 95% of the 483 comparable items (median 22).
Price per GB $3.50 per GB
Cheaper than about 87% 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 nameMushkin Enhanced
Model name976643A
Total capacity4 GB (2 × 2 GB)
Product type204-Pin DDR3 SO-DIMM
Performance
Rated speedDDR3 1066 (PC3 8500)
Memory
CAS latency7
Memory timings7-7-7-20
Kit configurationDual Channel kit
Power
Rated voltage1.5 V
Size & build
Shipping weight0.08 kg
Package size166 × 117 × 14 mm
Compatibility
Compatible withFor Apple Notebook

Questions about this item

Does the 204-pin DDR3 SO-DIMM form factor fit the memory slots in my Apple notebook?

Yes, each module uses the standard 204-pin DDR3 SO-DIMM layout that matches the slots used in compatible Apple notebooks.

What is the correct way to seat both sticks so the dual-channel kit runs at DDR3 1066 with 7-7-7-20 timings?

Insert each stick at the same angle, press down firmly until the side clips click on both modules, then verify the speed and timings in the system profiler.

When should I expect to replace these 1.5 V DDR3 modules in a typical laptop?

DDR3 SO-DIMMs have no moving parts and generally last the usable life of the notebook; replacement is only needed if a module fails or you upgrade capacity.

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