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Simply spoke, SuperFetch tries to relocate application data from the slow hard drive into all available memory. It utilizes the available capacity to create a so-called warm memory state for the single purpose of making applications available almost instantaneously. However, SuperFetch needs a certain amount of main memory. At only 512 MB RAM size, the feature won't be very efficient, as Windows plus 2-3 applications will already eat up the total memory capacity. There won't be main memory space left to pre-cache application data. If you don't work with multiple applications at a time, 1 GB should be enough to see a positive impact of SuperFetch when compared to Windows XP. However, we experienced the best results at a main memory capacity of 2 GB - more won't hurt either.
The results are impressive: Using both features, Windows Vista shows off how it can effectively reduce application launch times to provide a better performance experience with your everyday software. At only 512 MB RAM, application launch times decrease from 9 seconds (OpenOffice Writer 2.1) and 10 seconds (Outlook 2007) to 2-4 seconds only. Adding our 1 GB USB 2.0 Flash stick helped to shorten launch times for these applications to 2-3 seconds only. The next conclusion is that Windows Vista with only 512 MB RAM is no fun at all, because applications start much faster only by having 1 GB of RAM. In fact, both Outlook 2007 and OpenOffice Writer 2.1 start even faster on a fresh Windows Vista installation than on our SuperFetch-trained and ReadyBoost-enabled system at only 512 MB.