Solved! ASUS X556UA don't recognize new RAM

[icmartinez]

Hello,

I have a laptop ASUS X556UA. Exactly: i5-6200U, Intel graphics 520, W10 Home 64bits.
Memory RAM is DDR3 and it has 4GB non-removable.
I wanted a little RAM upgrade so I bought this: Hynix 4GB DDR3 1333MHz
(https/www.amazon.es/Hynix-4GB-DDR3-1333MHz-m%C3%B3dulo/dp/B00821QJ86/ref=sr_1_3?ie=UTF8&qid=1543837463&sr=8-3&keywords=hynix+4gb+sodimm+ddr3)

I plugged in it but neither PC nor CPU-Z recognize the new RAM.
I've searched on the Internet and I tried some options: plug in and out the RAM several times, updated BIOS (to version 405) from ASUS webpage and I disabled fast boot in BIOS.
RAM isn't still being recognized.
I tried Crucial test too and it says "Maximum Memory: 12GB".

I'm not sure what's happening. Maybe RAM stick is wrong?
Any solution or help will be appreciated.

PS: sorry about my English

 

[Lutfij]

You should've looked for DDR3L-1600MHz rams. Ideally you could've looked for an 8GB stick of DDR3L-1600MHz rated to run at 1.35v.