Ideally none .. however the system will have to work for a while before
it fills up the ~300MB not used by system/user tasks with 'semi-useful'
stuff like cached files. 8>.
Of course if you run Photoshop on large graphics files, then your 512MB
will disappear right smartly, and another 512MB might be needed if you
want fast performance.
As a general rule, you should not have any available RAM.
Available RAM is wasted RAM. You paid for all of it and shouldn't
want to see any of it wasted. Windows works hard to keep all your
RAM working for you all the time, for example using it for cache
if your apps don't need it, then taking it back again if your
apps need it later. This is good, not bad.
The system will do its very best to find *some* use for all of RAM, if
only a trivial one, and if you see Task Manager reporting that there is
'available physical RAM' you have more than you can use. It really
ought to be called 'memory for which Windows can find no conceivable
use', and it is a mistake to think that this is all that is available to
run another program - windows will instantly drop trivial uses to make
room. Read up more at www.aumha.org/win5/a/xpvm.htm
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