SK hynix 4GB DDR4-3200 SODIMM Laptop RAM (HMA851S6CJR6N-XN) – 1Rx16, PC4-25600

An exact-type replacement for 4GB modules in budget systems.

The SK hynix HMA851S6CJR6N-XN is a 4GB DDR4-3200 SODIMM with a 1Rx16 layout. It is designed for replacing failed 4GB modules in budget laptops, thin clients, point-of-sale terminals, and embedded systems, or for bringing a 4GB machine to 8GB in dual channel.

Why OEM Memory Is a Safe Laptop Upgrade

Thin clients, kiosks, point-of-sale terminals, and entry laptops often use 4GB DDR4 modules. When one fails, an identical replacement is the quickest way to restore the system to its original configuration.

This OEM module runs at 3200 MT/s with CL22 timings and steps down automatically on platforms with lower memory speeds.

In systems with two slots and one 4GB module, adding this module gives 8GB in dual channel, which helps lightweight workloads run more smoothly.

For Thin Clients and Embedded Systems

Fleet operators of thin clients and terminals can keep a spare stock of 4GB modules to replace failures quickly.

Low Power Operation

A 1Rx16 module with four chips draws little power, suited to compact and fanless devices.

How to Install the SK hynix 4GB SODIMM

1. Shut down the laptop, unplug the charger, and remove or disconnect the battery if the service manual says to.
2. Remove the memory access panel or bottom cover and release any existing module by spreading the side clips.
3. Insert the new module at about 30 degrees with the notch aligned, then press it flat until the clips lock.
4. Close the panel, power on, and confirm the new memory total in BIOS or your operating system.