Just remember that no amount of swap space can actually increase the amount of memory a single program can use which is 2 GB on normal Windows, 3 GB when large address aware (Poser 7 is, other versions not), and 4 GB on Windows 64 (for 32 bit programs, no real limit for 64 bit programs).

Swap space helps when you have multiple programs running (and since the OS is actually running several programs all the time you are always running multiple programs) and you have a limited amount of RAM. On normal (32 bit) Windows there is no need to ever have more than 8 GB in total (a maximum of 3 GB real memory and 5 GB swap space), on 64 bit Windows you want as much as possible.