Hi,

You can use Hynix DDR4 3200modules, Crucial modules etc, they will run at 3200MHz, these modules have JEDEC profile, but avoid buying Crucial Ballistic modules.

Hynix 8GB DDR4 PC4-25600 3200MHz 288-pin DIMM ram memory : Amazon.co.uk: Computers & Accessories

Acer Predator Orion 3000 PO3-630G-UW91 | Memory RAM & SSD Upgrades | Crucial UK

Acer Predator PO3-630G Performance Results - UserBenchmark

@Gabrgo

I would like to provide some additional info which will really help you. 

Kindly go through the details given below. The info provided below will be very helpful to get the current memory and ssd details of your computer and the options to upgrade it.  

Please visit the website given below. There is an option to "start your scan " and " select your computer " . Please chose the options and try it. It will show you the memory and SSD’s details and the best upgrade options for you.. 

https://www.crucial.com/

It will tell you what you currently have and what you can add for memory and SSD's. 

Note: If you decide to buy you can always compare the prices by visiting other websites or stores and then you can decide. We are providing the info of scan app just to show you the upgrade options. You can even download similar scan apps from other memory upgrade websites too.      

To check the compatibility of ram which you can use on your computer.. Get CPUz and check it with that in SPD section of all the RAM and specs that you have, its a quick and simple way to check all OEM specs and what you have in your system. 

No problem, yes that Crucial module will be fine.