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

SK hynix

SK hynix HMA851S6CJR6N 4GB 1Rx16 DDR4 2666MHz laptop RAM

SKU CH-2YW9-6MZSH MPN HMA851S6CJR6N

Adds 4 GB of DDR4 memory at 2666 MHz in a 260-pin SO-DIMM for laptop upgrades

  • 4GB capacity adds responsive multitasking headroom
  • DDR4 2666MHz speed delivers fast data throughput
  • 2V operation reduces laptop power draw
  • 260-pin SO-DIMM fits standard notebook slots
  • CL19 latency supports stable system timing

4 GB DDR4 SO-DIMM for laptop upgrades

This SK hynix module delivers 4 GB of DDR4 memory in a 260-pin SO-DIMM form factor. It runs at 2666 MHz with a PC4-21300 bus rating and CL19 latency. The single-rank 1Rx16 organisation and 1.2 V operation suit mainstream notebook platforms.

Check your current memory specification before

Confirm that your laptop accepts DDR4 SO-DIMM modules at 2666 MHz and non-ECC operation. Verify the existing stick uses 260 pins and 1.2 V voltage. Match the part number HMA851S6CJR6N or one of the listed compatible numbers such as 01AG823 or 862398-855 to avoid fitment issues.

Fits a single SO-DIMM slot

The module occupies one 260-pin slot and requires no extra cables or cooling. Its low-voltage design keeps power draw minimal inside the chassis. Installing this stick adds 4 GB capacity while any remaining slots stay available for further expansion.

How it compares

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

Price $31.99
Cheaper than about 72% of the 2,079 comparable items (median $70.99).

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

Specifications

No published specifications for this item yet.

Questions about this item

What comes in the box and do I need anything else to install it?

The module ships alone with no cables or manuals; you only need a laptop with a free DDR4 SO-DIMM slot.

How do I pick between the listed part numbers such as 01AG823 or 862398-855?

Match the exact part number on your original stick — HMA851S6CJR6N-VK — to one of the compatible numbers shown; they refer to the same 4 GB 1Rx16 specification.

What does the 2666MHz rating actually deliver once the RAM is fitted?

It sets the memory clock to 2666MHz with CL19 timing at 1.2V, giving the rated PC4-21300 data rate for compatible DDR4 SO-DIMM systems.

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