What kind of RAM can I install in my G751JM? It only comes with 8GB, but is expandable to 32GB. I have already installed and SSD, but I want to max out my RAM!

I bought the G751JM, and am having trouble with the computer since installing the SSD. I installed a Samsung 840 PRO 128GB SSD, and used the migration software to clone the HDD to the SSD. Since then , I looked up how to make it my primary boot drive...