Hello,
I would think that your world would be happy at the 4 GB level, unless you were interested in setting up a RAM disk, and keeping a lot of materials within it. RAM Disks are very very fast (the speed of RAM!), with the danger that if you loose power to the computer... the content within the RAM disk goes away too. I used to use RAM disks with OS 9... my OS X box does not have enough RAM for me to make a useful one and find out.
I do have a RAM disk on my Linux box that is used for small temporary files. I also liked using the RAM disk for internet temp / cache files and cocookies that I love to see crumble at the fate of the power cord.
Christian
kc0arf
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