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Green rectangular SO-DIMM circuit board with black memory chips and gold contacts

SK hynix

SK hynix HMA851S6AFR6N-UH 4GB DDR4 2400 CL17 laptop RAM

SKU CH-VES2-3WFCG MPN HMA851S6AFR6N-UH

Adds 4 GB of DDR4 2400 SO-DIMM memory for laptops with CL17 timing at 1.20 V

  • Total capacity4 GB
  • Rated speedDDR4 2400 (PC4 19200)
  • CAS latencyCL17
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Product type260-Pin DDR4 SO-DIMM
  • 4 GB capacity upgrades laptop memory for everyday tasks
  • DDR4 2400 speed delivers responsive data transfer rates
  • CL17 latency supports smooth multitasking performance
  • 20 V operation reduces power consumption and heat
  • 260-pin SO-DIMM form factor fits standard laptop slots

4 GB DDR4 laptop module

This single 4 GB DDR4 SO-DIMM runs at 2400 MT/s with CL17 latency and a standard 1.20 V operating voltage. It is an unbuffered, non-ECC module built on a 260-pin form factor for notebook platforms. The stick uses a 1Rx16 organisation and is sold as a new, single-piece upgrade.

Steady throughput on a fixed 1.20 V supply

Under sustained load the module maintains its rated 2400 MT/s speed without requiring a voltage increase, so thermal output stays predictable in thin chassis. CL17 timing remains stable during long sessions because the unbuffered design avoids extra register delay. The fixed 1Rx16 density prevents the rank-interleaving variability seen on higher-capacity sticks.

Press-in SO-DIMM install with one keyed notch

Installation is a straight press into the 260-pin slot until the side clips latch; the single key notch prevents backward insertion. The low-profile height clears most keyboard decks, but very slim ultraportables with soldered memory cannot accept this upgrade. Buyers who need more than 4 GB total capacity or who require ECC error correction should look elsewhere.

How it compares

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

Price $29.99
Cheaper than about 74% 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 $7.50 per GB
Pricier than about 65% 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 nameHMA851S6AFR6N-UH
Total capacity4 GB
Product type260-Pin DDR4 SO-DIMM
Performance
Rated speedDDR4 2400 (PC4 19200)
Memory
CAS latencyCL17
ECC supportNo
Buffer typeUnbuffered
Power
Rated voltage1.2 V

Questions about this item

How much heat and power does the 1.20V DDR4 2400 module generate under continuous load?

The module runs at 1.20 volts, the standard DDR4 voltage, so power draw and heat output stay low during all-day operation.

What must my laptop already have to accept this 260-pin SO-DIMM?

A free DDR4 SO-DIMM slot that supports 2400 MT/s memory and takes 260-pin unbuffered non-ECC modules.

Will this CL17 stick work alongside the CL19 memory already in my system?

Yes, the motherboard will run both modules at the slower CL19 timing automatically.

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