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@ewanmac
errr... I don't fully understand the practical difference, but I guess 64-bit. My understanding is that 64 bit allows you to better access the RAM which in turn increases the speed at which the computer can perform calculations?
More access to RAM seems like a good thing and it would certainly be silly to waste it by not having an adequate OS. My problem is that I don't really know how fast is fast enough. I will be using it to perform reasonably complicated spatial statistics (using ArcGIS) at a global scale and I know people who have to leave similar analyses running for days on their computer, I just don't know what it is that limits the speed (eg. number of pixels being processed, the complexity of the statistics etc?)