HawkDawg, I updated the FAQ because the first sentence you reported wasn't true anymore. With the latest versions of Sweet Home 3D installer, the max memory is set to 2 GB under 64-bit Windows and 640 MB under 32-bit Windows. This value is indicated in the About dialog.
Caution : I think that if you run a 32-bit Windows system on a 64-bit processor, Windows will let programs run in 32-bit mode only.