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Re: 64 bit cpu and Mathematica on windows.
Just a little further information. First, there has been a good, stable beta of Windows XP for AMD64 available (free) for some time. For once, Intel are playing catchup and just starting to produce "64-bit extended" chips that are compatible with the AMD hardware. The AMD 64-bit design is extremely neat for a lot of reasons. In particular, if you run a 64-bit operating system you can run both 32-bit and 64-bit code. 32-bit applications - such as your regular Mathematica for Windows - can then address more or less the whole 4-Gigabyte address space (rather than a typical 1.5G) because the operating system runs in 64-bit mode even when it is servicing 32-bit applications - so it does not use up any of the 4G theoretical limit. The 64 bit Mathematica should be able to address a vast quantity of memory. Of course, to be able to access all this memory it has to be physically present on your machine. I probably sound as though I work for AMD, but I don't - I just like their 64-bit design! David Bailey