You can do the same with your whole OS. With Linux at least. And some distros which enable that. Boot it from USB with a parameter (often via Menu) like "toram"

You can do the same with your whole OS. With Linux at least. And some distros which enable that. Boot it from USB with a parameter (often via Menu) like "toram", and be done with it. Even installing or deinstalling software, customizing it to your needs and likes, and remaster that in RAM to be rewritten into your custom boot-image, so you won't have to do that again and again in case of restart or the occasional kernel-updates. That is working for me, lazily reaching uptimes of about four months with no crashes in between. And everything is f***ing FAST!1!! :-)