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Four green DDR4 SODIMM sticks with black chips, 260 pins, no heat spreader

A-Tech

A-Tech 128GB Kit (4x32GB) DDR4 2666MHz SODIMM 260-Pin Memory Upgrade for Apple iMac 2019 2020

SKU CH-PYTS-AR2HT

A 128 GB DDR4 2666 MHz SODIMM kit with four 32 GB modules for 2019 and 2020 iMac models

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8
  • 128 GB total capacity from four 32 GB modules
  • DDR4 2666 MHz speed rated PC4-21300
  • 260-pin SODIMM form factor fits iMac slots
  • Non-ECC unbuffered 2Rx8 design for Mac compatibility
  • Tested for Apple iMac 2019 and 2020 models

128GB DDR4 2666MHz SODIMM Kit for iMac 2019/2020

This A-Tech kit contains four 32GB DDR4 2666MHz SODIMM modules for a total of 128GB. It is built as unbuffered, non-ECC memory with a 2Rx8 rank structure and runs at 1.20V. The 260-pin form factor matches the SO-DIMM slots used in compatible Apple desktop systems.

Suits 27-inch iMac 2019 and 2020 owners.

The kit is validated for Apple model IDs iMac19,1, iMac20,1 and iMac20,2 and order numbers MRQY2LL/A, MRR02LL/A, MRR12LL/A, MXWT2LL/A, MXWU2LL/A and MXWV2LL/A. Systems outside this list — including smaller iMacs, laptops, Mac mini, Mac Pro and non-Apple platforms — are not supported because the firmware tuning and slot configuration differ.

260-pin DDR4 SO-DIMM at 2666MHz

The decisive specification is the 260-pin DDR4 SO-DIMM interface operating at 2666MHz (PC4-21300). Only machines that accept this exact module type, speed and voltage will recognise the full 128GB capacity across all four slots.

How it compares

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

Price $607.99
Pricier than about 54% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $4.75 per GB
Cheaper than about 80% of the 20,941 comparable items (median $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 nameA-Tech
Product lineA-Tech DDR4 Apple Mac RAM Memory Upgrades
Total capacity128 GB (4 × 32 GB)
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple Mac Systems

Questions about this item

Does this 260-pin SODIMM kit fit the memory slots of a 27-inch iMac from 2019 or 2020?

Yes, the four 32 GB modules are built for the 260-pin SO-DIMM slots used in the 27-inch iMac models released in 2019 and 2020.

What is the correct way to seat all four modules so the iMac recognises the full 128 GB?

Power off, unplug, open the memory door, insert each module at a slight angle then press firmly until the side clips click; a common mistake is stopping before the clips engage.

Will the memory require any firmware updates or component replacements over time?

No firmware updates are needed; the modules are non-ECC unbuffered DDR4 with major-brand chips and have no moving parts or batteries to replace.

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