at last i thought im the one who is wrong here
.if u mean 1 GB of ur own pc then it wont get much players . for me i think while opening the server on 1 GB rams of ur PC (hamachi) actually u are using less than 600 MB cuz ur pc already Is using a hell of programs and files ..
but 1 GB rams of a vps would be pure
, and will get u much much more
Regards