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Green circuit board with black memory chips and gold edge connector

Computer Memory Solutions

Computer Memory Solutions CM512648500SODRH 4GB DDR3 1066MHz SO-DIMM

SKU CH-KS3M-QQ424

4GB DDR3 1066MHz SO-DIMM for Apple MacBook Pro 13" Mid-2009 Core 2 Duo 2.53GHz

  • Total capacity4 GB
  • Rated speedDDR3 1066 (PC3 8500)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL7
  • Memory timings7-7-7
  • Rated voltage1.5 V
  • 4GB capacity upgrades your MacBook Pro 13" 2.53 GHz
  • DDR3 1066 MHz PC3-8500 speed matches factory specification
  • CL7 7-7-7 timings deliver responsive system performance
  • 204-pin SO-DIMM form factor fits the Mid-2009 memory slot
  • Unbuffered non-ECC design ensures hassle-free installation

Compatible MacBook Pro upgrade

This 4 GB DDR3 SO-DIMM is built for the Apple MacBook Pro "Core 2 Duo" 2.53 13-inch (Mid-2009). It installs in a 204-pin slot and runs at 1066 MHz with CL7 timing. The module is unbuffered, non-ECC and uses major-brand chips at 1.5 V.

Replaces factory 2 GB or 4 GB modules

The MacBook Pro 5,5 (A1278) ships with two sockets and a 4 GB ceiling when updated to Boot ROM MBP 51.007E. B05 and Mac OS X 10.6. Swapping the original sticks for this 4 GB unit lets you reach the 8 GB maximum in a 2 × 4 GB configuration. Buyers who need more than 8 GB total cannot use this platform.

Steady operation at rated speed

Rated at PC3-8500 with 7-7-7 timings, the module maintains its 1066 MHz data rate without a heat spreader. Unbuffered DDR3 at 1.5 V keeps power draw low during extended workloads such as video encoding or virtual machines. No thermal throttling is expected under normal laptop airflow.

How it compares

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

Price $17.99
Cheaper than about 92% of the 21,161 comparable items (median $397.99).
Total capacity 4 GB
Lower than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $4.50 per GB
Cheaper than about 81% 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 nameComputer Memory Solutions
Model nameCM512648500SODRH
Total capacity4 GB
Product type204-Pin DDR3 SO-DIMM
Performance
Rated speedDDR3 1066 (PC3 8500)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL7
Memory timings7-7-7
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsApple Macbook Pro "Core 2 Duo" 2.53 13 in (Sd/Fw)
In the box
Included items1 Memory RAM Stick

Questions about this item

Will this 204-pin DDR3 SO-DIMM fit the memory slots in my MacBook Pro 13" Mid-2009?

Yes, the module matches the 204-pin DDR3 SO-DIMM form factor used by the MacBook Pro "Core 2 Duo" 2.53 13" (Mid-2009) and seats directly into its two SO-DIMM sockets.

What is the correct way to seat the module so the Mac recognises the full 4 GB?

Insert the stick at a slight angle until the gold contacts disappear, then press down firmly until both side clips click — the common mistake is stopping at the first click and leaving the module partially seated.

When should I consider replacing this memory stick?

Replace it if the Mac fails the memory test at startup, shows repeated kernel panics, or will not boot after a macOS upgrade — otherwise the module has no moving parts and requires no scheduled maintenance.

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