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Four green circuit boards with gold contacts and black chips

A-Tech

A-Tech 64GB Kit (4x16GB) DDR4 2666MHz SODIMM 260-Pin memory upgrade for Apple iMac 2019 2020

SKU CH-4MS0-8EMDT

Four 16 GB DDR4 2666 MHz SODIMM modules add 64 GB to 27‑inch iMac 2019 or 2020 models

  • Capacity64GB (4 x 16GB)
  • SpeedDDR4 2666 (PC4 21300)
  • Voltage1.20V
  • ECCNo
  • Buffered/RegisteredUnbuffered
  • Rank2Rx8
  • 64 GB capacity lets you run heavy workloads smoothly
  • 2666 MHz DDR4 speed matches Apple iMac 2019 2020 specifications
  • Four 16 GB SODIMM modules fill every slot in the 27-inch iMac
  • 20 V low-voltage operation keeps power draw minimal
  • Non-ECC unbuffered design ensures direct compatibility with iMac19,1 iMac20,1 iMac20,2

System-Specific DDR4 Upgrade Kit

This 64GB kit contains four 16GB DDR4 2666MHz SODIMM modules built for Apple iMac 2019 and 2020 models. It targets owners of the 27-inch Retina 5K all-in-one who need the maximum factory-supported memory capacity. The unbuffered, non-ECC design matches the original system requirements exactly.

Capacity and Headroom

Four slots are fully populated with 16GB modules, delivering 64GB total at 1.20V. This configuration handles heavy multitasking, large creative projects and virtual machines without paging. The 2Rx8 rank structure is validated for the supported iMac19,1 and iMac20,1/20,2 model IDs. No further internal expansion is possible once all slots are filled.

Apple-Certified Compatibility

The kit carries Apple order numbers MRQY2LL/A, MRR02LL/A, MRR12LL/A, MXWT2LL/A, MXWU2LL/A and MXWV2LL/A alongside model numbers A2115 and EMC 3442. It is engineered solely for the listed 2019 and 2020 iMac systems. Buyers with earlier iMacs, MacBook Pro, Mac mini or any Windows PC cannot use these modules.

Besonderheiten

  • 64 GB capacity lets you run heavy workloads smoothly
  • 2666 MHz DDR4 speed matches Apple iMac 2019 2020 specifications
  • Four 16 GB SODIMM modules fill every slot in the 27-inch iMac
  • 20 V low-voltage operation keeps power draw minimal
  • Non-ECC unbuffered design ensures direct compatibility with iMac19,1 iMac20,1 iMac20,2

Technische Daten

BrandA-Tech
SeriesA-Tech DDR4 Apple Mac RAM Memory Upgrades
Capacity64GB (4 x 16GB)
SpeedDDR4 2666 (PC4 21300)
Voltage1.20V
ECCNo
Buffered/RegisteredUnbuffered
Rank2Rx8
ChipsetMajor Brand Chipset
Heat SpreaderNo
Compatible SystemApple Mac Systems
FeaturesMajor Brand Chips

Fragen zu diesem Artikel

Will this 64GB kit work alongside the original 8GB modules in my 2019 27-inch iMac?

Apple iMac 2019 and 2020 models have four SODIMM slots. This kit fills all four with 16GB modules, so the original memory must be removed before installation.

How can I verify the 2666MHz speed is active after installing the four 16GB modules?

Open About This Mac or System Report after booting; the Memory section will show 64GB total at 2666MHz DDR4 across all four slots.

Does the box include any tools or just the four 260-pin SODIMM modules?

The package contains the four 16GB DDR4 2666MHz SODIMM modules only; no tools or additional accessories are included.

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