"Will my software be limited by the same memory constraints on a 64bit machine as when on a 32bit machine"
Fair question! The reality is that when using a 64bit machine on an AMD chip the operating system, which is common to both the 32bit and 64bit persona's of the machine, does not capitalise the space allocated to the windows application execution environment.
This means that even without utilizing Advanced Windowing Extensions (AWE) you can access up to 4GB of memory rather than having to rely on 3GB and what can be stolen from the OS temporarily.
Go to 'tell me more about AMD use of memory' to get further details and there are lots of links therein to increase your knowledge about the subject area.
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