Once past a certain point for a given application, more RAM does not
improve performance. Once you're past 3G of installed RAM, what makes
the biggest difference in Lightroom performance for either WinXP and
Mac OS X is faster disk io and more free space on the disk. Even 64bit
doesn't make as big a difference.
The same goes for dual- vs quad-core cpus. Yes, LR takes advantage of
distributing processing threads, but there are limits to how much gain
can be had from doing that.
G
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