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Green printed circuit board with black memory chips and gold edge connector

Computer Memory Solutions

Computer Memory Solutions 4GB DDR3 1333 SO-DIMM Apple MacBook Pro Core i5 2.4 13.3 MD313LL/A A1278

SKU CH-5BAS-XNH42

A 4 GB DDR3 1333 SO-DIMM module built for the 13.3" MacBook Pro (Core i5 2.4, Late 2011, A1278)

  • Total capacity4 GB
  • Rated speedDDR3 1333 (PC3 10600)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL7
  • Memory timings7-7-7
  • Rated voltage1.5 V
  • 4GB DDR3 module upgrades a Late 2011 MacBook Pro 13.3
  • CL7 timing at 1333 MHz delivers responsive multitasking
  • 5 V unbuffered design matches factory power requirements
  • 204-pin SO-DIMM fits the MD313LL/A slot exactly
  • Major-brand chips backed by CMS lifetime warranty

Apple MacBook Pro 13.3" Late 2011 memory

This 4 GB DDR3 SO-DIMM is built specifically for the Apple MacBook Pro "Core i5" 2.4 13.3" MD313LL/A A1278. It installs directly into the 204-pin slot without configuration changes. The module is new and covered by the manufacturer's lifetime warranty when purchased from Computer Memory Solutions.

Suitable for single-slot upgrades on this model

Owners of the identified MacBook Pro can add one 4 GB stick to reach higher total memory. Systems that require ECC, registered buffers, a different pin count or a voltage other than 1.5 V cannot use this module. Buyers needing more than one stick should verify the two-socket limit before ordering.

204-pin DDR3 1333 MHz CL7 specification

The decisive spec is the 204-pin DDR3 1333 (PC3-10600) interface with CL7 timing at 1.5 V unbuffered. Only MacBook Pro models matching MD313LL/A and A1278 accept this exact combination. Any other pin layout, speed grade or voltage will prevent installation.

How it compares

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

Price $19.99
Cheaper than about 91% 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 $5.00 per GB
Cheaper than about 77% 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 nameCM5126410600SODRH
Total capacity4 GB
Product type204-Pin DDR3 SO-DIMM
Performance
Rated speedDDR3 1333 (PC3 10600)
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 I5 in 2.4 13.3 in Md313Ll/A A1278
In the box
Included items1 Memory RAM Stick

Questions about this item

How do I install the 204-pin DDR3 SO-DIMM in the MacBook Pro 13.3" Late 2011, and what step do people often miss?

Remove the bottom case, release the side clips, insert the module at an angle until the gold contacts are hidden, then press down firmly until both clips click — the step most people miss is pressing hard enough to seat it fully.

Will this 4GB DDR3 1333 module need any maintenance or replacement during the laptop's life?

No routine maintenance is required; the unbuffered non-ECC stick has no moving parts or heat spreader, so it either works for the system's lifetime or is replaced only if a fault appears.

What is the first limit reached when the MacBook Pro 13.3" MD313LL/A runs sustained workloads with this memory installed?

The machine's two-slot architecture caps total memory at 16GB, so capacity is the first constraint — this single 4GB module leaves one slot open for a future upgrade.

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