_DD said:
I know that in general, XP will try to make use of as much ram as is
available. But I'd love to know where the performance tradeoffs
'corner' in systems with medium to heavy usage.
In other words, I expect the change from 512MB to 1GB to be fairly
significant.
Actually, it probably will *not* be significant (although it depends on what
apps you run). The improvement may even be zero.
How will the change from 1GB to 1.5GB compare to that?
(I would not expect a linear curve)
It not only isn't linear, it really isn't even a curve. For most people,
going from 1GB to 1.5GB will provide *no* increase in performance.
You get good performance if the amount of RAM you have keeps you from using
the page file, and that depends on what apps you run. Most people running a
typical range of business applications find that somewhere around 256-384MB
works well, others need 512MB. Almost anyone will see poor performance with
less than 256MB. Some people, particularly those doing things like editing
large photographic images, can see a performance boost by adding even more
than 512MB--sometimes much more.
If you are currently using the page file significantly, more memory will
decrease or eliminate that usage, and improve your performance. If you are
not using the page file significantly, more memory will do nothing for you.
Go to
http://billsway.com/notes_public/winxp_tweaks/ and download
WinXP-2K_Pagefile.zip and monitor your pagefile usage. That should give you
a good idea of whether more memory can help, and if so, how much more.