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Two green DDR3L SODIMM sticks with black chips, 204-pin, no heat spreaders

A-Tech

A-Tech 8GB (2×4GB) DDR3L 1866 SODIMM 204-Pin memory upgrade

SKU CH-Q9A1-75RT7

DDR3L 1866 SODIMM kit adds 8 GB across two 4 GB modules for compatible Late 2015 iMac models

  • Total capacity8 GB (2 × 4 GB)
  • Rated speedDDR3L 1866 (PC3L 14900)
  • ChipsetMajor Brand Chipset
  • Rated voltage1.35 V
  • Buffer typeUnbuffered
  • Memory rank1Rx8
  • 8GB dual-channel kit speeds up multitasking on compatible iMacs
  • DDR3L 1866 MHz PC3-14900 matches factory memory specs
  • 35 V low-voltage modules run cooler in slim 27-inch chassis
  • Non-ECC unbuffered 1Rx8 design installs without BIOS changes
  • Tested for Apple iMac Retina 5K Late 2015 (iMac17,1)

Target system

This A-Tech 8GB kit is built for the Apple iMac Retina 5K 27-inch Late 2015 and matches the factory specifications for that machine. It delivers two 4GB DDR3L SODIMM modules rated at 1866 MHz with a low 1.35 V operating voltage. The memory uses unbuffered non-ECC chips in a 1Rx8 organisation and carries the Apple order numbers MK462LL/A, MK472LL/A and MK482LL/A for direct compatibility.

Who this suits

The kit is intended for owners of the iMac model identifier iMac17,1 who want to populate both SODIMM slots with matched capacity. Buyers needing a single module, a different total capacity, ECC error correction, registered buffering, a higher or lower voltage, or a different pin count will not be served by this specific part. The 204-pin form factor and DDR3L signalling limit use to platforms designed for that exact combination.

Deciding specification

The critical figure is DDR3L 1866 (PC3L 14900) at 1.35 V in a 204-pin unbuffered non-ECC SODIMM. Only systems that specify this exact speed, voltage, pin layout and ECC type will accept the modules without instability or physical mismatch.

How it compares

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

Price $38.99
Cheaper than about 81% 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 $4.87 per GB
Cheaper than about 78% 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 capacity8 GB (2 × 4 GB)
Performance
Rated speedDDR3L 1866 (PC3L 14900)
Processor
ChipsetMajor Brand Chipset
Memory
ECC supportNo
Buffer typeUnbuffered
Memory rank1Rx8
Heat spreaderNo
Power
Rated voltage1.35 V
Compatibility
Compatible systemsApple Mac Systems

Questions about this item

Should I pick this 8GB kit with two 4GB modules instead of a single 8GB stick?

This kit contains two 4GB modules for dual-channel operation on the iMac (Retina 5K, 27-inch, Late 2015), model ID iMac17,1 and EMC 2834.

What does the 1866 MHz speed mean once installed in my iMac?

The DDR3L 1866/1867 MHz (PC3-14900) rating matches the memory controller specification for the compatible iMac models, allowing the system to run at its designed memory bandwidth.

Will the 204-pin DDR3L SODIMM fit and run at the correct voltage in my Mac?

Yes, the modules are 204-pin DDR3L SODIMMs operating at 1.35V, which is the correct form factor and voltage for the supported Apple iMac (Late 2015) systems.

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