Adamanta
128GB (4x32GB) Memory Upgrade for 2020 Apple iMac 27" w/Retina 5K Display & 2019 Apple iMac 27" w/Retina 5K Display DDR4 2666Mhz PC4-21300 SODIMM 2Rx8 CL19 1.2v DRAM RAM
*Price sourced from Amazon.com. Last updated 2026-07-22. Price and availability subject to change.
Bottom line: The 128GB (4x32GB) Memory Upgrade for 2020 Apple iMac 27" w/Retina 5K Display & 2019 Apple iMac 27" w/Retina 5K Display DDR4 2666Mhz PC4-21300 SODIMM 2Rx8 CL19 1.2v DRAM RAM is a niche pick — read recent reviews before buying in the memory & ram category, priced around $840.00. Read recent reviews carefully before committing.
SpecPicks Verdict
SpecPicks classifies Adamanta 128GB (4x32GB) Memory Upgrade for 2020 Apple iMac 27"… as a niche pick — read recent reviews before buying in the memory & ram category, based on our editorial and benchmark analysis and our ranking model that weights rating × review-volume × price-fit. Adamanta's positioning sits within the broader category mid-tier. Use the Compare tool to put it side-by-side with two or three close alternatives before clicking through to Amazon.
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 Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.
Pros & Cons
Pros
- ✓ We always have hundreds in stock! Every single module is fully tested by the manufacturer.
- ✓ Backed by Adamanta's warranty and support channels
- ✓ Ships via Amazon with Prime eligibility and the standard returns policy
Cons
- ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
- ✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified
Key Features
- 128GB ( 4x32GB ) DDR4 2666 MHz Non-Parity/Non-ECC Unbuffered SODIMM Memory 260 pin Dual Rank Module. 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 Excludes major OEMS such as Samsung, Hynix, Micron, etc.
- Memory Upgrade Compatible with 2020 27 inch iMac w/ Retina 5K Display model ID: 20,1 20,2 (i5 3.1GHz, i5 3.3GHz, i7 3.8GHz, i9 3.6GHz). Models: MXWT2LL/A, MXWU2LL/A, MXWV2LL/A
- Memory Upgrade Compatible with Early 2019 27-inch iMac w/ Retina 5K Display model ID: 19,1 (i5 3.0GHz, i5 3.1GHz, i5 3.7GHz, i9 3.6GHz)
- We always have hundreds in stock! Every single module is fully tested by the manufacturer.
- Our experienced technicians can verify if these parts will work for you with free technical support.
Full Specifications
| Brand | Adamanta |
|---|---|
| Voltage | 1.2 Volts |
| RAM Size | 128 GB |
| Unit Count | 1.0 Count |
| Form Factor | SO-DIMM |
| Memory Speed | 2666 MHz |
| Model Number | AM52SE24G64-SQ |
| Number of Pins | 260 |
| Mfr Part Number | AM52SE24G64-SQ 2019 iMAC FBA (4) |
| Memory Generation | DDR4 |
| Compatible Devices | Desktop |
| Data Transfer Rate | 2666 MHz |
| Memory Form Factor | SODIMM |
| Additional Features | Lightweight |
Ready to buy?
Adamanta 128GB (4x32GB) Memory Upgrade for 2020 Apple iMac 27" w/Retina 5K Display & 2019 Apple iMac 27" w/Retina 5K Display DDR4 2666Mhz PC4-21300 SODIMM 2Rx8 CL19 1.2v DRAM RAM is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-07-22. Price and availability subject to change.
Related Memory & RAM
More guides & deep dives from the SpecPicks archive
Browse all articles & guides →- Best Retro Handhelds in 2026 — From $35 to $500
- How to Build a Windows 98 Retro PC in 2026
- Emulation Hardware in 2026: FPGA, Software, and Cart-Reader Ecosystems
- RTX 4070 Super vs RX 7800 XT — Which to Buy in 2026
- The Complete Voodoo5 5500 AGP Driver Guide (2026 Edition)
- Best 1440p Gaming GPUs in 2026
- Best Budget Gaming PC Build 2026 — ~$1,000 ($800 on Sale)
More reviews from the SpecPicks archive
Browse all reviews →- Does Ryzen 3D V-Cache Speed Up CPU-Only LLM Inference?
- DualSense vs 8BitDo Pro 2 vs GameSir G7 SE: Best PC Controller in 2026
- Forza Horizon 6 on Steam Deck: How Well Does It Run?
- MSI RTX 3060 Ventus vs ZOTAC RTX 3060 Twin Edge: Which 12GB Card to Buy
- llama.cpp vs Ollama vs LM Studio on an RTX 3060 12GB (2026)
- Fable 5 as Manager: The Delegate-to-Sonnet-5 Cost Pattern
- Best Raspberry Pi Alternatives for SBC Enthusiasts in 2026
- pxpipe Hides Prompts in PNGs to Cut Claude Code Tokens 70% — Or Just Run Local on an RTX 3060
- vLLM vs llama.cpp for Single-User Local Chat on a 12GB GPU
- Best 4K Monitor Under $300 for RTX 3060 12GB Gaming in 2026
- Intel llm-scaler-vllm PV 1.4 Adds Arc Pro B70 Support: What Local-LLM Builders Get
- This Switch 2 Dock Looks Exactly Like an N64 — and Holds Six Game Cards
- GPU Benchmark Data Freshness and Source Attribution in 2026
- Sega's TMSS Explained: The Lock-Out Chip Behind the Genesis, and Why It Still Trips Up Reissues
- Best SSD for PS4 Pro Upgrade in 2026: SATA Picks That Actually Cut Load Times
- Best SATA SSD to Revive an Old Laptop: Crucial BX500 vs Samsung 870 EVO
- Troubleshooting WinXP Audigy FX Install Failures in 2026
- Best Wireless Controller for PC Gaming in 2026
- AMD Ryzen AI Halo Ships with a Fully Open-Source Linux Stack
- Building a Silent Pentium III Windows 98 Gaming Rig in 2026
- Best Quiet CPU Cooler for Silent Workstation and Office Builds 2026
- Intel Arc B60 Stable Diffusion: Setup & Benchmarks 2025
- Forza Horizon 6 on the RTX 3060 12GB: 1080p and 1440p Settings Guide
- Running Local LLMs on a Raspberry Pi 4 8GB: tok/s, Quantization, and What Actually Works