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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

  • Capacity8GB (2 x 4GB)
  • SpeedDDR3L 1866 (PC3L 14900)
  • Voltage1.35V
  • ECCNo
  • Buffered/RegisteredUnbuffered
  • 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.

Highlights

  • 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)

Specifications

BrandA-Tech
SeriesA-Tech DDR3 Apple Mac RAM Memory Upgrades
Capacity8GB (2 x 4GB)
SpeedDDR3L 1866 (PC3L 14900)
Voltage1.35V
ECCNo
Buffered/RegisteredUnbuffered
Rank1Rx8
ChipsetMajor Brand Chipset
Heat SpreaderNo
Compatible SystemApple Mac Systems
FeaturesMajor Brand Chips

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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