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Four green circuit boards with gold edge connectors and black memory chips

A-Tech

A-Tech 32GB (4x8GB) DDR3L 1866 SODIMM 204-Pin Memory Upgrade

SKU CH-B4K4-M2W4E

A 32 GB DDR3L 1866 MHz SODIMM kit for upgrading compatible 2015 Apple iMac models

  • Total capacity32 GB (4 × 8 GB)
  • Rated speedDDR3L 1866 (PC3L 14900)
  • ChipsetMajor Brand Chipset
  • Rated voltage1.35 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8
  • 32 GB total capacity for demanding multitasking across four 8 GB modules
  • DDR3L 1866 MHz speed matches Late 2015 iMac specifications
  • 35 V low-voltage operation reduces power draw and heat
  • 204-pin SO-DIMM form factor fits Apple iMac (Retina 5K, 27-inch, Late 2015)
  • Non-ECC unbuffered 2Rx8 design validated for macOS stability

Target system

This 32 GB kit is built for the Apple iMac (Retina 5K, 27-inch, Late 2015) with model ID iMac17,1 and order numbers MK462LL/A, MK472LL/A and MK482LL/A. It fills all four SO-DIMM slots with matched 8 GB modules.

Sustained workload behaviour

DDR3L 1866 runs at 1.35 V, so the modules generate less heat than standard-voltage DDR3 during long multitasking sessions. The 2Rx8 unbuffered design keeps latency stable when the system is pushing large datasets through all 32 GB.

Installation notes

Each stick is a 204-pin SO-DIMM that slides into the iMac's bottom memory door; no tools are required beyond a screwdriver for the access panel. The only common issue is inserting a module at an angle, which prevents the retention clips from engaging fully.

How it compares

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

Price $89.99
Cheaper than about 69% of the 21,161 comparable items (median $397.99).
Total capacity 32 GB (4 × 8 GB)
Typical for this category: the median of 20,941 items is 32 GB.
Price per GB $2.81 per GB
Cheaper than about 91% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameA-Tech
Product lineA-Tech DDR3 Apple Mac RAM Memory Upgrades
Total capacity32 GB (4 × 8 GB)
Performance
Rated speedDDR3L 1866 (PC3L 14900)
Processor
ChipsetMajor Brand Chipset
Memory
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.35 V
Compatibility
Compatible systemsApple Mac Systems

Questions about this item

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

Each 8 GB module operates at 1.35 V, so the four-module kit runs cooler and draws less power than standard 1.5 V DDR3 during sustained workloads.

Which iMac models must I already own for this 204-pin SODIMM kit to fit?

The kit is validated for iMac (Retina 5K, 27-inch, Late 2015) with model ID iMac17,1 and order numbers MK462LL/A, MK472LL/A, MK482LL/A.

Will the 1866 MHz modules down-clock automatically if my Late 2015 iMac originally shipped with slower DDR3?

Yes, the DDR3L 1866 modules will run at the highest speed the iMac's memory controller supports, matching the original specification without manual setup.

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