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Green circuit board with black memory chips and gold edge contacts

SK hynix

SK hynix HMA851S6CJR6N-VK_UB 4GB DDR4 SO-DIMM 2666MHz CL19 1.2V

SKU CH-Q7YK-GAKNB MPN HMA851S6CJR6N-VK_UB

A 4 GB DDR4 SO-DIMM running at 2666 MHz with CL19 latency and 1.2 V operation

  • 4GB capacity supports everyday multitasking on laptops
  • DDR4 architecture runs at 2666MHz for responsive performance
  • Low 1.2V voltage reduces power draw and heat
  • CL19 latency keeps data access quick
  • 260-pin SO-DIMM fits standard laptop memory slots

Memory for laptops

This module adds 4 GB of DDR4 memory to a notebook that uses a 260-pin SO-DIMM slot. It is suited for owners replacing a failed stick or expanding a single-channel configuration up to the platform limit.

Build integration

The stick runs at 1.2 V and conforms to the PC4-21300 standard, so it draws the same power as the original factory memory. Non-ECC operation means it works in consumer laptops that do not support error-correcting code. No extra cables, brackets or software are required.

Sustained operation

Rated at 2666 MHz with CL19 timings, the module maintains its specified frequency during long workloads such as video encoding or large dataset processing. The 1Rx16 organisation keeps the electrical load light on the memory controller, helping stability over extended sessions.

How it compares

Measured against everything we stock in Cable Locks & Laptop Extras, at today’s prices. Recalculated every night.

Price $34.99
Pricier than about 73% of the 8,808 comparable items (median $16.99).

Specifications

No published specifications for this item yet.

Questions about this item

Will the CL19 latency limit throughput when the module runs at 2666MHz all day?

CL19 is the rated CAS latency at 2666MHz; sustained throughput follows that timing.

Does the 1.2V SO-DIMM generate noticeable heat or fan noise during continuous laptop use?

Standard 1.2V DDR4 SO-DIMMs run cool and add no audible noise to the system.

Must the laptop already have a free 260-pin DDR4 slot and support PC4-21300 non-ECC memory?

Yes, the module needs an open 260-pin DDR4 SO-DIMM slot that accepts non-ECC PC4-21300 memory.

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