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Green rectangular DDR4 SODIMM module with black chips and gold contacts

NEMIX RAM

NEMIX RAM 8GB DDR4 2133 CL15 260-pin SODIMM Apple iMac 21.5" Mid 2020 memory upgrade

SKU CH-FJ05-70SZA

8GB DDR4 2133 CL15 SODIMM module upgrades 21.5-inch iMac Mid 2020 with 1.2V unbuffered memory

  • Total capacity8 GB
  • Rated speedDDR4 2133 (PC4 17000)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL15
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • 8GB capacity adds responsive multitasking headroom for 21.5" iMac Mid 2020
  • DDR4 2133 speed matches factory specification for stable operation
  • CL15 latency keeps data access snappy during everyday workloads
  • 2 V low voltage reduces power draw and heat in the slim chassis
  • 260-pin SODIMM form factor fits the iMac memory slot without adapters

8GB DDR4 2133 SODIMM for iMac 21.5" Mid 2020

This 8GB DDR4 2133 CL15 module is built specifically for the Apple 21.5-inch iMac released in Mid 2020. It uses a 260-pin SODIMM form factor, runs at 1.2V, and carries a CL15 latency rating. The kit suits owners of that exact iMac model who need a single-slot memory upgrade. It is not ECC or registered memory.

Replaces factory 4GB or 8GB DDR4 2133 sticks

The Mid 2020 iMac ships with soldered or slotted DDR4 2133 memory depending on configuration. This module matches the original speed, voltage, and timing so it works without BIOS changes. The jump is worth it when the system shows memory pressure during multitasking, virtual machines, or large creative projects. It does not add capacity beyond the board’s maximum slot limit.

Steady throughput at CL15 under sustained workloads

Unbuffered DDR4 2133 at CL15 delivers consistent bandwidth during long render, compile, or analysis sessions. The 1.2V operation keeps thermal output low inside the compact iMac enclosure. No heat spreader is fitted, so airflow from the system fans handles cooling directly. Performance scales linearly with the number of populated slots up to the platform maximum.

How it compares

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

Price $43.99
Cheaper than about 79% of the 21,161 comparable items (median $397.99).
Total capacity 8 GB
Lower than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $5.50 per GB
Cheaper than about 70% 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 nameNEMIX RAM
Product lineApple iMac/Mac Mini Compatible Series Memory
Model nameApple DDR4 2133 MHz Non-ECC Unbuffered SODIMM
Part numberMS17000-828K1
Total capacity8 GB
Product type260-Pin DDR4 SODIMM
Performance
Rated speedDDR4 2133 (PC4 17000)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL15
ECC supportNo
Buffer typeUnbuffered
Heat spreaderNo
Memory rank2Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple
In the box
Included items8 GB (1 × 8 GB) DDR4 2133 MHz PC4-17000 2Rx8 1.2 V CL15 260-PIN Non-ECC Unbuffered SODIMM

Questions about this item

Will this 260-pin DDR4 SODIMM fit the memory slot in my 21.5-inch 2020 iMac?

Yes, the 260-pin DDR4 SODIMM form factor matches the slot used in the 21.5-inch iMac from 2020.

What is the correct way to seat the module so the iMac recognises the full 8 GB?

Insert the SODIMM at a slight angle until the gold contacts disappear, then press down firmly until both side clips click into the notches.

Does this non-ECC unbuffered module need any firmware updates or battery replacements over time?

No firmware or battery maintenance is required; the module is a passive component that either works or fails, in which case it would be replaced.

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