Rpi max ram

[hommar]

Swap is great till you have to use it. Then everything gets thousands of times slower.

Good idea for swap is iRAM and HyperDrive

if make it as USB storage or TF card...

[W. H. Heydt]

if u want to know wat i want to do its run mincraft on a pi 0

A Pi0 has 512MB of RAM. Anything beyond that (less the GPU requirments) will be swap space and--as already noted--*thousands* of times slower than physical RAM. MinecraftPi can run on a Pi0, but you probably won't much like it. On a Pi3B, it runs quite well.

The general version of Minecraft runs on x86 processors ("Wintel" PCs), which use a completely different hardware architecture. x86 programs, when they can be run under simulation at all, run many, many times slower than they do on x86 hardware.

I'm dreadfully sorry if this is all disappointing to you, but you really need to "do your homework" as to what is feasible...or even possible. The Pi is *not* a substitute for a desktop PC when it comes to what programs you run. You need to find Linux-based substitutes that have been compiled to run on ARM processors.