The ASUS ROG 5 Ultimate`s 18GB of RAM is crazy, but awesome
(Android Central)

You absolutely do not need 18GB of RAM in your phone, but having it there doesn`t hurt anything. Plus it`s kind of cool! Yep. The new ASUS Republic of Gamers Phone 5 Ultimate (that`s a mouthful) has up to 18 GB of RAM under the hood. That`s enough to store over 19 billion ASCII characters if you were writing the longest email ever or even enough to play Cyberpunk 2077 with Ray Tracing enabled if it were on your video card, so it`s a lot. Unneccessary? ✔️ Cool anyway? ✔️ It`s also completely unnecessary but so very cool. Don`t ask me why I think it`s so cool because I don`t really have an answer other than `you can have 18GB of RAM inside a phone and that`s so cool!` but I know there are at least a few people out there that agree with me on that. Enough about the cool factor, though. The real question would be how practical it is to have 18GB of RAM inside a phone, no matter if it`s sold as a gaming phone or not. That one is easy to answer — it`s not practical at all...