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Four green circuit boards with black chips and gold pins

NEMIX RAM

NEMIX RAM 64GB (4x16GB) DDR3 1866 PC3-14900 1.35V 204-Pin SODIMM for iMac 27" Late 2015

SKU CH-5B9X-5XSB3

64 GB kit of four 16 GB DDR3 1866 SODIMMs at 1.35 V, built for the 27-inch iMac Late 2015

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR3 1866 (PC3 14900)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL13
  • Buffer typeUnbuffered
  • Rated voltage1.35 V
  • 64 GB kit expands iMac 27" Late 2015 memory to maximum capacity
  • DDR3 1866 PC3-14900 speed matches factory specification exactly
  • 35 V low-voltage modules reduce power draw and heat
  • 204-pin SODIMM form factor fits the iMac memory slots directly
  • CL13 CAS latency delivers responsive performance for demanding workloads

64GB DDR3 kit for 27" iMac Late 2015

This 64GB kit contains four 16GB DDR3 1866 SODIMM modules built for the 27-inch iMac with Retina 5K display released in 2015. It delivers 64GB total capacity at PC3-14900 speed with CL13 latency and 1.35V operation. The unbuffered non-ECC design matches the original specification for this all-in-one system.

Verify 204-pin DDR3 SODIMM slots and 1.35V support

Confirm your iMac uses 204-pin DDR3 SODIMM slots and accepts 1.35V low-voltage modules before ordering. The Late 2015 27-inch model requires four modules to reach 64GB, so all four slots must be populated. Check the owner's manual for the exact installation sequence and any firmware requirements.

Four matched modules simplify installation

The kit supplies four matched 16GB modules in a single package, removing the need to source individual sticks or mix capacities. Matched 2Rx8 ranking across all modules helps maintain stability under load. No heat spreaders are included, keeping the low-profile form factor required for the iMac's tight internal clearance.

How it compares

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

Price $557.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB (4 × 16 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $8.72 per GB
Typical for this category: the median of 20,941 items is $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 numberMS14900-428LK4
Total capacity64 GB (4 × 16 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 items64 GB (4 × 16 GB) DDR3 1866 MHz PC3-14900 2Rx8 1.35 V 204-PIN Non-ECC Unbuffered SODIMM KIT

Questions about this item

What comes in the 64GB kit and is anything else needed for installation?

The kit contains four 16GB DDR3 1866 SODIMM modules totalling 64GB; no extra parts are required for the iMac 27" Late 2015 memory slots.

Why choose this 4x16GB kit over a smaller capacity?

Four 16GB modules fill all four slots of the iMac 27" Late 2015, delivering the maximum 64GB supported by that model.

What does the PC3-14900 rating mean for actual performance in the iMac?

PC3-14900 confirms DDR3 1866 speed with CL13 latency at 1.35V, matching the factory specification for the Late 2015 27-inch iMac.

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