The Razer has 8GB of RAM, as much as the typical Windows computer. Do you think it can have more apps in memory than an iPhone with 3GB of RAM? Well no **** Sherlock.
The question should be, why does a mobile OS needs that much RAM to perform well? I mean even many Windows gaming machines come with just 8GB of RAM.
8GB of RAM in a PC is not the same as 8GB of RAM in a phone and you know that.