memory as in ram, or memory as in disk space?
ram- because I use a heap of virtual machines at once as environments for testing server and network setups... and I have a nasty habit of leaving heaps of tabs open in chrome.
disk capacity - because I use this machine as a network file server and as a pxe server for booting other machines, basically it stores OS images, HDD images[for virtual machines], recorded TV, game footage, games, as well as several years worth of backups, am into photography too, and raw images are not small, data redundancy is good also.
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Arch Linux x64, P8400, 4GB PC-6400
Ubuntu Linux/Win 7 x64 X4 955BE, 12GB PC-12000, GTX 570