The SATURN executables are developed as 32-bit Windows applications and they will happily run under both versions of the Windows OS and produce the same results. The principle advantage for SATURN when running within a 64-bit OS is the ability for the individual programs to access (or ‘address’) more memory. Practical testing has shown that the limit for 32-bit SATURN is around 1.5Gb of system memory and this may be exceeded for very large OBA-based models.