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Green rectangular SO-DIMM module with black memory chips and gold contacts

SK hynix

SK hynix HMA851S6JJR6N 4GB DDR4 2666MHz CL19 1Rx16 1.2V laptop RAM

SKU CH-ZZCC-SN6NB MPN HMA851S6JJR6N

Adds 4GB of DDR4 laptop memory at 2666MHz with CL19 latency and 1.2V operation

  • Adds 4 GB capacity for smoother multitasking
  • 2666 MHz DDR4 speed handles everyday workloads
  • CL19 latency keeps response times consistent
  • 2 V operation reduces power draw
  • 260-pin SO-DIMM fits standard laptop slots

4GB DDR4 2666MHz SO-DIMM

This SK hynix module adds 4GB of DDR4 memory to a compatible laptop. It runs at 2666MHz with CL19 latency and operates at the standard 1.2V. The 260-pin SO-DIMM form factor fits the memory slots found in many recent notebooks.

Suitable for standard laptop upgrades

This single-rank 1Rx16 stick suits owners replacing a failed module or adding capacity to an open slot where 4GB matches the system limit. Builders needing higher density per slot, ECC error correction or a different speed grade should look at other modules.

1Rx16 single-rank organisation

The module uses a 1Rx16 layout, meaning all 4GB sit on one rank of sixteen-bit chips. Some laptop chipsets only accept this specific rank-width combination, so verify the original part number before ordering.

Points forts

  • Adds 4 GB capacity for smoother multitasking
  • 2666 MHz DDR4 speed handles everyday workloads
  • CL19 latency keeps response times consistent
  • 2 V operation reduces power draw
  • 260-pin SO-DIMM fits standard laptop slots

Caractéristiques

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Questions sur cet article

My laptop only has one free SO-DIMM slot — is this 260-pin module the right form factor?

Yes, this is a 260-pin SO-DIMM designed for laptop memory slots, so it will fit a single available slot.

Will this CL19 2666 MHz stick downclock reliably if my system only supports lower DDR4 speeds?

DDR4 modules are designed to run at lower speeds when the memory controller requires it, so this stick will operate at the maximum speed your platform allows.

After installing this 4 GB 1Rx16 module, how can I confirm it is running at 2666 MHz CL19?

Open Task Manager or a tool like CPU-Z; the memory tab will show 4 GB capacity, 2666 MHz speed and CL19 timings when the system is using the module at its rated specification.

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