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Adamanta 16GB (2x8GB) Apple Memory Upgrade Compatible with Late 2015 iMac 27" Retina 5K Display DDR3/DDR3L 1867Mhz PC3L-14900 SODIMM 2Rx8 CL13 1.35v RAM DRAM
Adamanta

Adamanta 16GB (2x8GB) Apple Memory Upgrade

Bottom line: The Adamanta 16GB Apple Memory Upgrade: Exact Late 2015 iMac 27" 5K fit: MK462LL/A, MK472LL/A, MK482LL/A, and built-to-order units; main trade-off: locked to Late 2015 27" 5K iMacs; no use in 21.5" iMacs or other Macs.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

Pros & Cons

Pros

  • ✓ Exact Late 2015 iMac 27" 5K fit: MK462LL/A, MK472LL/A, MK482LL/A, and built-to-order units
  • ✓ Correct 1867MHz PC3L-14900 2Rx8 CL13 spec that Skylake iMacs require, not generic DDR3
  • ✓ Limited lifetime warranty from Adamanta on defective modules
  • ✓ 1.35V low-voltage DDR3L draws less power and runs cooler than 1.5V DDR3

Cons

  • ✗ Locked to Late 2015 27" 5K iMacs; no use in 21.5" iMacs or other Macs
  • ✗ 16GB total means both stock 4GB sticks come out, leaving spares you cannot resell easily
  • ✗ DDR3L at 1867MHz is a dead-end standard with no upgrade path to DDR4
  • ✗ Warranty excludes physical or cosmetic damage, so a bent SODIMM notch is on you

Manufacturer description

This Adamanta 16GB kit (2x8GB) targets one machine specifically: the Late 2015 iMac 27-inch with 5K Retina Display. If you own an MK462LL/A, MK472LL/A, MK482LL/A, a refurbished unit, or any built-to-order Late 2015 configuration, these DDR3L SODIMMs drop into the rear access door without tools or firmware changes. The spec sheet is exact: 1867MHz PC3L-14900, 204-pin, 2Rx8 dual rank, CL13 timing, 1.35V low voltage, unbuffered and non-parity. That combination matters, because Skylake-era iMacs reject generic laptop DDR3 that misses the 1867MHz or dual-rank requirement. Doubling your iMac from…

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SpecPicks Verdict

SpecPicks scored Adamanta 16GB Apple Memory Upgrade using a rating × review-volume × price-fit model applied to published specs and reviews across the memory & ram category. Adamanta's memory & ram lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for memory & ram of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

Will this work in my Late 2015 27-inch iMac?

Yes, if it is a 27-inch Late 2015 with 5K Retina Display. Adamanta lists MK462LL/A, MK472LL/A, MK482LL/A, refurbished units, and all built-to-order Late 2015 27-inch configurations, including every Skylake spec. Adamanta's technicians will verify fit if you contact them first.

Do I need to remove the existing memory to install this?

This is a 16GB kit of two 8GB modules. The Late 2015 27-inch iMac has four SODIMM slots, so you can add these alongside existing sticks or replace them. For a clean 16GB matched pair, pull the stock modules and install both Adamanta sticks.

Is 1867MHz DDR3L the right speed for this iMac?

Yes. The Late 2015 27-inch 5K iMac uses 204-pin DDR3/DDR3L at 1867MHz, PC3L-14900, unbuffered and non-parity. This kit matches that exactly at 2Rx8 dual rank, CL13, 1.35V. Slower 1600MHz laptop memory is a common mismatch on this model.

What does the Adamanta warranty actually cover?

Adamanta offers a limited lifetime warranty on its own branded memory, replacing defective modules with the same or similar specifications. Physical and cosmetic damage are excluded. Every module is fully tested by the manufacturer before shipping. Check the product listing for current claim details.

Is this memory reliable enough for a daily-driver machine?

Adamanta states every module is fully tested at the factory. For a compatibility-critical Apple upgrade, that factory testing is a meaningful reliability signal.

Key Features

  • Compatible with: MK462LL/A, MK482LL/A, MK472LL/A, refurbished, and all built to order late 2015 iMacs 27 inch with 5K Retina Display.
  • 16GB ( 2x8GB ) DDR3L 1867 Mhz Late 2015 iMac Unbuffered Non-Parity SDRAM 204pin Low Voltage Dual Rank Module. Works with all iMacs with Skylake Processors. This module works for 27" late 2015 iMac's of every spec.
  • Limited lifetime warranty by Adamanta. We will replace defective memory with the same or similar memory specifications. Physical or cosmetic damages are not covered by the limited lifetime warranty by Adamanta. Only limited to Adamanta branded Memory.
  • Every single module is fully tested by the manufacturer.
  • Our experienced technicians can verify if these parts will work for you.

Full Specifications

BrandAdamanta
Voltage1.35 volts
RAM Size16 GB
Unit Count2 Count
Form Factor204-PIN
Memory Speed1867 MHz
Model NumberAM42SE21G64-NR
Number of Pins204
Compatible withMK462LL/A, MK482LL/A, MK472LL/A, refurbished, and all built to order late 2015 iMacs 27 inch with 5K Retina Display.
Mfr Part NumberAM42SE21G64-NR L15 (2)
Number of Items1
Memory GenerationDDR3L
Compatible DevicesDesktop
Data Transfer Rate1867 MHz
Memory Form FactorSODIMM
Additional FeaturesLightweight
Computer Memory Size16 GB
RAM Memory TechnologyDDR3
Column Address Strobe Latency13
Full listing titleAdamanta 16GB (2x8GB) Apple Memory Upgrade Compatible with Late 2015 iMac 27" Retina 5K Display DDR3/DDR3L 1867Mhz PC3L-14900 SODIMM 2Rx8 CL13 1.35v RAM DRAM

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Adamanta 16GB (2x8GB) Apple Memory Upgrade Compatible with Late 2015 iMac 27" Retina 5K Display DDR3/DDR3L 1867Mhz PC3L-14900 SODIMM 2Rx8 CL13 1.35v RAM DRAM is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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Adamanta 16GB (2x8GB) Apple Memory Upgrade Compatible with Late 2015 iMac 27" Retina 5K Display DDR3/DDR3L 1867Mhz PC3L-14900 SODIMM 2Rx8 CL13 1.35v RAM DRAM
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