Its really easy to fill it up. AmigaOS has RAM: (ramdisk.device)
A lot of ppl like to play their games from RAM: the first time they try them to decide if they are any good. Other ppl do it the other way around and only put a game in their RAM: if they do like it, to make it load faster. These are things random ppl tell me.
I used to do this all the time with Dune II
'Twas lightning fast running from the RAM, and had no wait states.
Amiga WAS memory starved from the beginning. If only A1200 was launched with 2+2MB of RAM we would have had more then 2x faster machine, and with room for little extra gaming material.