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Four green DDR4 SODIMM sticks with black chips

Timetec

Timetec MR-H16D426S7E 64GB (4x16GB) DDR4 2666 CL19 laptop RAM

SKU CH-ND6G-XB082

Four 16 GB DDR4 2666 CL19 SO-DIMM modules totalling 64 GB for compatible 27-inch iMac models

  • Capacity64GB (4 x 16GB)
  • Type260-Pin DDR4 SO-DIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.20V
  • ECCNo

Capacity 64GB (4 x 16GB)

  • 64GB kit expands memory headroom for demanding workloads
  • Four 16GB modules fill all slots on compatible iMacs
  • DDR4 2666 speed matches factory specification for Mid 2020 and Mid 2019 27-inch models
  • CL19 latency and 1.2V voltage keep power draw low
  • 260-pin SO-DIMM form factor fits Apple laptop memory sockets

64GB DDR4 2666 Kit for iMac

This 64GB kit contains four 16GB DDR4 2666 SO-DIMM modules built for 27-inch iMac models from 2019 and 2020. Each module runs at 1.2V with CL19 latency and uses the standard 260-pin unbuffered non-ECC layout. The kit targets owners of compatible iMacs who want the maximum memory those systems accept.

Tested voltage and signal integrity

Every module is tested at component level for voltage tolerance, temperature resistance and signal integrity before assembly. That validation aims to deliver stable operation inside the tight thermal envelope of the supported iMacs without requiring any firmware changes or manual timing adjustments.

Four slots filled for 64GB total

The 2019 and 2020 27-inch iMacs provide four SO-DIMM slots, so this kit occupies all of them and delivers 64GB of addressable memory. That capacity handles large creative workloads, virtual machines and heavy multitasking. The Late 2018 Mac mini only offers two slots, so this kit cannot be used there.

Highlights

  • 64GB kit expands memory headroom for demanding workloads
  • Four 16GB modules fill all slots on compatible iMacs
  • DDR4 2666 speed matches factory specification for Mid 2020 and Mid 2019 27-inch models
  • CL19 latency and 1.2V voltage keep power draw low
  • 260-pin SO-DIMM form factor fits Apple laptop memory sockets

Specifications

BrandTimetec
ModelMR-H16D426S7E
Capacity64GB (4 x 16GB)
Type260-Pin DDR4 SO-DIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.20V
ECCNo
Buffered/RegisteredUnbuffered
Recommend UseFor Apple System

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Questions about this item

Will the four 16 GB modules need any periodic cleaning or firmware updates after installation?

No maintenance is required once the SODIMMs are seated; the unbuffered DDR4 modules have no moving parts or user-serviceable firmware.

What limit appears first when the memory runs continuously at 2666 MHz CL19 in a 27-inch iMac?

The CAS latency of 19 cycles at 1.20 V sets the timing boundary; sustained throughput cannot exceed the rated PC4-21300 specification.

How much heat and fan noise should I expect when all four 16 GB sticks run all day in a 27-inch iMac?

Each module operates at the standard 1.20 V DDR4 voltage, so thermal output matches Apple's original memory design and the system's existing cooling curve.

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