A:Answer Lol Asus being not nice. Yes you can, and it can be any brand, but there are some compatability things to take note of. The ram should be DDR4 since thats the type installed according to the page. The CPU can support ram speeds up to 3200, see link below. Also, the motherboard can only support certain channels (# ram sticks installed). If you see all the ram is in 1 stick in your build, buy 1 more since almost all motherboards support dual channel (google motherboard manual to see which 2 slots to fill) If you have 2 installed in your build, you will need to buy 2 more, since tripple channel support is very rare. Press ctrl+alt+delete after installing to see if the new ram is registering.
Edit: removed link and not nice word to follow guidelines