Atari 8-bit or 8-bit Atari?

English is my second language and I wonder if I should write "Atari 8-bit" or "8-bit Atari" or both forms are acceptable?

This forum is called "Atari 8-Bit Computers", so I assume that's correct. Is "8-bit Atari Computers" incorrect?

"Music of an Atari 8-bit computer" is "Atari 8-bit music" or "8-bit Atari music" ?

Thank you.