Only applications that are optimized for 64-bit will run faster than their 32-bit counterparts. In a previous article about Vista 圆4, I outlined how the 64-bit version will usually only perform better as it allows you to use more memory, rather than because of its computing capacity. I’m lucky that my laptop supports up to 16GB. My own laptop has 8 GB of RAM and I can tell you that I need every byte of it. As such, if you now deploy Windows 7 32-bit then you might be soon want to move to 64-bit, just because you will have to upgrade your machines with new memory. Since XP needs 512 MB-1GB to run properly, XP Mode is a RAM eater. This feature might prove to be useful for other purposes, for example running Office 2007 and Office 2003 on the same computer simultaneously. One example is Windows 7's XP Mode feature, which allows you to use legacy applications within a virtual machine running within Windows XP. Moreover, it is only a matter of time until 3GB will no longer be enough for modern applications. Thus, if you install Windows 7 64-bit on a 4 GB machine you won't waste 1 GB of RAM like you would with Windows 7 32-bit. By contrast, Windows 7 圆4 cannot only make use of up to 16TB 192GB RAM, but is capable of using the memory remapping feature of modern BIOSes, which allows the operating system to really use the complete 4GB.
The problem is that like Vista, Windows 7 x86 is capable of only using about 3 GB of RAM. One thing that has changed since I last concerned myself with this topic is that most new desktops and laptops now come with at least 4GB of RAM.
The most significant advantage of a 64-bit system is that it can use more than 4GB of RAM.
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