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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.

Highlights

  • 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

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.

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

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