>Hi, again!
>Taking in attention performance (relative
>to RAM and processor) which option is the best:
>a) Have 4 databases in 1 instance of SQL;
>b) Have 2 databases at 2 instances of SQL.
>Thanks in advance
>******
>TONY Nascimento
>Cape Verde Islands
>West Coast Africa
>*********************

I think 4 databases in 1 instance of SQL is faster because you don't have the overhead in the server for the other copy of SQL Server running.

Maybe in a 64 bits machine or in a machine with 2 processors the answer varies.