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Green circuit board with black memory chips and gold edge connector

Computer Memory Solutions

Computer Memory Solutions 4GB DDR3 1600 SO-DIMM MacBook Pro 13.3" 2.5GHz

SKU CH-A4GY-4B3VF

A 4 GB DDR3 1600 SO-DIMM module built for the 13.3-inch MacBook Pro 2.5 GHz Intel Core i5

  • Total capacity4 GB
  • Rated speedDDR3 1600 (PC3 12800)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL11
  • Memory timings11-11-11
  • Rated voltage1.5 V
  • 4GB capacity adds responsive multitasking for MacBook Pro 13.3
  • DDR3 1600 speed matches factory specification for 2.5GHz Intel Core i5
  • 204-pin SO-DIMM form factor fits the MD101LL/A memory slots exactly
  • CL11 11-11-11 timing at 1.5V delivers stable operation without voltage tweaks
  • Computer Memory Solutions brand with lifetime warranty ensures validated compatibility

4 GB DDR3 SO-DIMM for MacBook Pro

This 4 GB DDR3 1600 SO-DIMM module is built specifically for the Apple MacBook Pro 13.3 inch 2.5 GHz Intel Core i5. It installs in a 204-pin slot and runs at 1.5 V with CL11 timing. The single stick expands memory in systems that use PC3-12800 speed.

DDR3 1600 bandwidth ceiling

The DDR3 1600 interface caps transfer rates at PC3-12800, so this module cannot exceed that throughput. It is unbuffered, non-ECC memory with 2Rx8 organisation, matching the original specification. Systems limited to two slots reach 8 GB maximum capacity.

Upgrade from 2 GB or 4 GB factory fit

Replacing a 2 GB stick doubles usable memory for smoother multitasking and heavier browser workloads. The jump is worth it when the MacBook Pro still runs a supported macOS and the second slot is free or already populated with a matching 4 GB module.

How it compares

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

Price $9.99
Cheaper than about 97% 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 $2.50 per GB
Cheaper than about 92% 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 nameCM5126412800SODRH
Total capacity4 GB
Product type204-Pin DDR3 SO-DIMM
Performance
Rated speedDDR3 1600 (PC3 12800)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL11
Memory timings11-11-11
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsApple Macbook Pro 13.3 in 2.5 GHz Intel Core I5
In the box
Included items1 Memory RAM Stick

Questions about this item

Should I choose the single 4GB stick or look for an 8GB kit for my MacBook Pro 13.3" 2.5GHz?

This listing is a single 4GB module; the MacBook Pro 13.3" 2.5GHz has two slots and supports up to 8GB total, so adding a second 4GB stick later will reach the maximum.

What does the 1600 MHz rating deliver once the module is installed in the MacBook Pro?

The memory runs at DDR3 1600 (PC3 12800) with CL11 11-11-11 timing at 1.5V, giving the rated bandwidth and latency for that platform.

Does the 204-pin DDR3 SO-DIMM interface limit the speed or capacity I can use in this MacBook Pro?

The 204-pin DDR3 SO-DIMM form factor matches the MacBook Pro 13.3" 2.5GHz slots, and the system caps total memory at 8GB across the two sockets.

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