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Two green circuit-board SO-DIMM sticks with black chips

Computer Memory Solutions

Computer Memory Solutions CM5126412800SOSRL 8GB (2x4GB) DDR3L 1600 memory upgrade

SKU CH-0124-RMZF7

Two 4 GB DDR3L 1600 SO-DIMM modules at 1.35 V for the Late 2013 27-inch iMac Core i7 3.5

  • Total capacity8 GB (2 × 4 GB)
  • Rated speedDDR3L 1600 (PC3L 12800)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL11
  • Memory timings11-11-11
  • Rated voltage1.35 V
  • 8 GB kit expands iMac memory for smoother multitasking
  • 1600 MHz DDR3L speed matches Late 2013 iMac specification
  • 35 V low-voltage modules reduce power draw and heat
  • CL11 11-11-11 timings deliver responsive system performance
  • 204-pin SO-DIMM form factor fits both iMac memory slots

Tailored Apple iMac upgrade

This 8 GB kit contains two 4 GB DDR3L SO-DIMM modules built specifically for the Apple iMac Core i7 3.5 27-Inch (Late 2013) model MF125LL/A. Each stick uses a 204-pin layout and runs at 1.35 V. The kit fills both memory slots to reach the system's 16 GB maximum capacity. It is intended for owners of that exact iMac seeking a straightforward capacity increase.

Steady CL11 operation at 1600 MHz

The modules operate at DDR3L 1600 (PC3L 12800) with CL11 11-11-11 timings across sustained workloads. Unbuffered, non-ECC 1Rx8 organisation delivers consistent throughput for everyday multitasking and media editing. Low 1.35 V voltage reduces thermal pressure inside the compact all-in-one chassis during extended sessions. Stability is maintained without a heat spreader under normal operating conditions.

Direct slot fit with lifetime exchange

Standard 204-pin SO-DIMM connectors align with the iMac's two memory slots for tool-free installation. Major-brand chipsets are used on every module to minimise compatibility risk. The manufacturer provides a limited lifetime exchange or repair warranty against defects when purchased directly. Buyers needing ECC error correction or registered buffering should look elsewhere.

How it compares

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

Price $78.99
Cheaper than about 70% of the 21,161 comparable items (median $397.99).
Total capacity 8 GB (2 × 4 GB)
Lower than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $9.87 per GB
Typical for this category: the median of 20,941 items is $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 nameCM5126412800SOSRL
Total capacity8 GB (2 × 4 GB)
Product type204-Pin DDR3 SO-DIMM
Performance
Rated speedDDR3L 1600 (PC3L 12800)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL11
Memory timings11-11-11
ECC supportNo
Buffer typeUnbuffered
Memory rank1Rx8
Heat spreaderNo
Power
Rated voltage1.35 V
Compatibility
Compatible systemsApple iMac"Core i7 in 3.5 27 in (Late 2013) MF125LL/A
In the box
Included items2 Memory RAM Sticks

Questions about this item

How much power does the DDR3L 1.35V kit draw when the iMac runs all day?

Each module operates at 1.35V, lower than standard DDR3, so the pair draws less power and generates less heat inside the 27-Inch Late 2013 chassis.

What must the iMac already have for this 204-pin SO-DIMM pair to install?

Two free DDR3 SO-DIMM slots; the Late 2013 27-Inch iMac ships with two user-accessible slots, so the 2 x 4GB kit fills them directly.

Will the CL11 1600MHz sticks work with the original 1600MHz memory Apple fitted in 2013?

Yes, both run at DDR3-1600; the Mac will clock the new CL11 modules to match the existing timings automatically.

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