@5, lol... I agree.
@7, If I may... I would consider not just applications, but what you are doing now and what, if any immediate benefits you'll see by going to 64 bit (where memory at 4 GB is the least good reason to switch).
That said, security is perhaps the best reason to switch to 64 bit. The simple facts are that very few exploits are written that can address a system running x64. Obscurity and all that comes with it. Similarly, address space as you know, is randomized in x64 on Windows Vista.
So if security above that found in 32 bit versions of Vista is the driver, then by all means, make the move if you have 4 GB of RAM. As to RAM and it being the primary driver behind a move, 4 GB of memory at 64 bit doesn't offer a whole lot more than 3 GB at 32 bit. Larger block sizes are used to store the same amount of information, so the trade up/off isn't all that great. I would consider using at least 8 GB of RAM and set that as an initial goal for RAM whem moving to 64 bit.
8 GB of RAM brings up another point about such a move and that centers on one's hardware in general. I'd not move unless I was also moving to an X38 based main board, or something similar and similarly, I'd get a multi-CPU MB so two quad core CPU's could be added vice one. The reason being is how memory is addressed in banks and if one is going to make such a move and invest on average, 2500 USD in parts, it makes sense to build around the architecture and do it in a way that allows you to move up easily and without re-hashing the HAL as one used to have to do. There is a sweet spot with newer XEON quads and with RAM being so cheap, one can make such a move for under 3K (USD).
So unless security is the main reason, please consider providing the build with hardware designed for the architecture to begin with. You won't regret it.
Finally, SP1 for Visat 32 bit does address the cosmetic anomally where the amount of memory installed is not reflected properly (vice the amount available to Windows). In SP1 in most cases (BIOS dependent) Vista will report 4 GB of RAM in most places in the OS.
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