That application's address space really isn't an issue, though. The OS handles that. The application doesn't care where it's loaded in memory just as long as it can play peacefully there.Message Jason -Another argument against going with a 64 bit system that nobody mentioned: Even if you have 32 Gigs of memory in your new system, your engineering applications will (most likely) not be able to use more than that 3.5 or 4 Gigs!!
The chances of there being a single application that needs more than 4 GB of physical memory are pretty slim for the next decade or so.