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Two green SO-DIMM sticks with gold contacts, 8GB kit

SK hynix

SK hynix HMA851S6DJR6N-VK 8GB (2×4GB) DDR4 2666 laptop RAM

SKU CH-9V7D-0MPV8 MPN HMA851S6DJR6N-VK

Adds 8 GB of DDR4 2666 memory in two 4 GB SO-DIMM modules at 1.20 V CL19

  • Total capacity8 GB (2 × 4 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Product type260-Pin DDR4 SO-DIMM
  • 8 GB total capacity in a matched pair of 4 GB modules
  • DDR4 2666 speed rated at PC4-21300 for responsive multitasking
  • Low 1.20 V operation reduces power draw and heat
  • CL19 latency timing supports smooth everyday performance
  • 260-pin SO-DIMM form factor fits standard laptop memory slots

8 GB DDR4 2666 SO-DIMM kit

This SK hynix kit provides 8 GB of DDR4 laptop memory across two 4 GB modules. The SO-DIMMs run at 2666 MHz with a CAS latency of CL19 and operate at the standard 1.20 V. They are unbuffered and non-ECC, matching the common specification for mainstream notebooks.

Suits standard DDR4 laptop upgrades

Builders upgrading a notebook that accepts 260-pin DDR4 SO-DIMMs at 2666 MHz can use this pair. Systems that require ECC registered modules or a different pin count cannot use this kit. Buyers needing a single 8 GB stick or a higher total capacity should look at other configurations.

260-pin DDR4 SO-DIMM form factor

The decisive specification is the 260-pin DDR4 SO-DIMM interface combined with the DDR4 2666 (PC4-21300) speed rating. Only platforms that support this exact pin layout and data rate will accept the modules.

How it compares

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

Price $48.99
Cheaper than about 59% of the 2,079 comparable items (median $70.99).
Total capacity 8 GB (2 × 4 GB)
Lower than about 60% of the 1,886 comparable items (median 16 GB).
Price per GB $6.12 per GB
Typical for this category: the median of 1,886 items is $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 capacity8 GB (2 × 4 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

Does the DDR4 2666 interface cap at PC4-21300 bandwidth in practice?

Yes, the kit runs at DDR4-2666 which corresponds to a PC4-21300 data rate.

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

Each module uses the standard 260-pin DDR4 SO-DIMM form factor used by most modern notebooks.

How do I install the two 4 GB sticks, and what step do people often miss?

Power off, unplug, open the panel, insert each stick at an angle until the side clips click — many forget to press down firmly until both clips lock.

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