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Green rectangular SO-DIMM module with gold edge connectors and black chips

SK hynix

SK hynix HMA851S6DJR6N-VK 4 GB DDR4 2666 laptop RAM

SKU CH-BR8R-WJ4RZ MPN HMA851S6DJR6N-VK

4 GB DDR4 2666 MHz SO-DIMM laptop memory with CL19 latency and 1.20 V operation

  • Total capacity4 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Product type260-Pin DDR4 SO-DIMM
  • 4 GB capacity upgrades everyday laptop performance
  • 2666 MHz DDR4 speed handles multitasking smoothly
  • CL19 latency keeps data access responsive
  • 20 V operation reduces power draw
  • 260-pin SO-DIMM fits standard laptop slots

Ideal for laptop memory upgrades

This SK hynix SODIMM adds 4 GB of DDR4 memory to a notebook. It suits owners who need a straightforward capacity increase for everyday tasks. Buyers who want more storage or require ECC error correction should look elsewhere.

Runs at DDR4 2666 with CL19 timing

The module operates at 2666 MT/s (PC4-21300) with a CAS latency of 19. This single speed rating determines whether the part matches the system's memory controller. No other frequency or latency figures apply.

Draws 1.20 V with no active cooling needed

Standard DDR4 voltage keeps power draw low and eliminates the need for a fan or heatsink. The unbuffered design runs silently in normal use. Thermal output stays minimal inside the laptop chassis.

How it compares

Measured against everything we stock in Laptop RAM, at today’s prices. Recalculated every night.

Price $27.99
Cheaper than about 76% of the 2,079 comparable items (median $70.99).
Total capacity 4 GB
Lower than about 80% of the 1,886 comparable items (median 16 GB).
Price per GB $7.00 per GB
Pricier than about 61% of the 1,886 comparable items (median $5.94 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameHYNIX
Product lineSODIMM Laptop Memory
Model nameHMA851S6DJR6N-VK
Total capacity4 GB
Product type260-Pin DDR4 SO-DIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportNo
Buffer typeUnbuffered
Power
Rated voltage1.2 V

Questions about this item

What does the 2666 MHz speed mean once the module is installed in a laptop?

The module runs at 2666 MT/s, delivering a peak transfer rate of 21300 MB/s when the system memory controller operates at that frequency.

What does the PC4-21300 designation cap in practice?

PC4-21300 specifies a maximum bandwidth of 21300 MB/s at 2666 MT/s; the laptop's memory controller will not exceed this rate.

Will the 260-pin SO-DIMM fit my laptop's memory slot?

The module uses the standard 260-pin DDR4 SO-DIMM form factor, which fits any laptop slot designed for DDR4 SO-DIMM memory.

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