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Green circuit board with black memory chips and gold edge connector

NEMIX RAM

NEMIX RAM 4GB DDR3 1866MHz PC3-14900 1.35V 204-Pin SODIMM iMac Late 2015 27 memory upgrade

SKU CH-9W6P-5157J

4 GB DDR3 SODIMM running at 1866 MHz with CL13 latency and 1.35 V for late-2015 27-inch iMac

  • Total capacity4 GB
  • Rated speedDDR3 1866 (PC3 14900)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL13
  • Buffer typeUnbuffered
  • Rated voltage1.35 V
  • 4GB capacity expands iMac Late 2015 memory for smoother multitasking
  • DDR3 1866MHz PC3-14900 speed matches factory specifications exactly
  • 35V low-voltage operation reduces power draw and heat output
  • 204-pin SODIMM form factor fits 27-inch Retina iMac slot directly
  • CL13 CAS latency delivers responsive memory access timing

iMac Late 2015 27-inch memory upgrade

This 4 GB DDR3 SODIMM module is built specifically for the Apple iMac Late 2015 27-inch model 17,1. It installs in a single 204-pin slot and adds 4 GB of system memory for everyday workloads. The kit contains one unbuffered non-ECC stick rated at PC3-14900 speed.

Low-voltage operation and thermal profile

Running at 1.35 V the module draws less power than standard DDR3 parts, helping keep internal temperatures modest in the all-in-one chassis. With no heat spreader the design relies on the iMac's existing airflow, so acoustic levels remain unchanged during typical use.

Direct-fit compatibility and lifetime warranty

The stick uses major OEM chips from Samsung, Micron or Hynix and matches the factory CL13 timing without BIOS adjustments. NEMIX RAM backs the module with a lifetime replacement warranty and technical support from IT staff familiar with Mac upgrades. Not suited for systems requiring ECC, registered memory or capacities above 4 GB per slot.

How it compares

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

Price $15.99
Cheaper than about 93% of the 21,161 comparable items (median $397.99).
Total capacity 4 GB
Lower than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $4.00 per GB
Cheaper than about 84% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineApple iMac/Mac Mini Compatible Series Memory
Model nameApple DDR3 1866 MHz Non-ECC Unbuffered SODIMM
Part numberMS14900-428LK1
Total capacity4 GB
Product type204-Pin DDR3 SODIMM
Performance
Rated speedDDR3 1866 (PC3 14900)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL13
ECC supportNo
Buffer typeUnbuffered
Heat spreaderNo
Memory rank2Rx8
Power
Rated voltage1.35 V
Compatibility
Compatible systemsApple
In the box
Included items4 GB (1 × 4 GB) DDR3 1866 MHz PC3-14900 2Rx8 1.35 V 204-PIN Non-ECC Unbuffered SODIMM KIT

Questions about this item

How do I install the 204-pin SODIMM into my iMac 17,1, and which step do people often miss?

Remove the power cord, press the memory compartment door button, eject the existing modules by spreading the side clips, align the notch on the 204-pin SODIMM with the slot key, press firmly until the clips click shut, then replace the door before reconnecting power.

What maintenance or replacement will this 1.35V DDR3 module need over time?

No routine maintenance is required; the module has no heat spreader and no moving parts. Replace it only if memory diagnostics report errors or if you upgrade to a higher-capacity kit supported by the iMac 17,1.

What limit appears first when this CL13 1866MHz kit runs sustained workloads?

The DDR3 1866MHz CL13 specification sets the bandwidth ceiling; under sustained load the memory controller will throttle to stay within the 1.35V JEDEC voltage envelope before thermal limits become a factor.

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