depends on the player count, any mods and what you plan to do with it.

1GB for vanilla with fwends
2GB for mods with fwends
4GB+ if you are going to be running a public server with a lot of players
8GB+ for that but with mods

you can cheap out and do it with less but that^ is for the best quality

Mr. Fagologist uses 69 dicks for his asshole. KILLEM

top quality banter mate