Killo Bite 02:52 15 Oct 2007

Its Chip density but I wouldn't think about it, I would just go to Crucial.co.uk and either select the machine in the list by brand & Model OR Motherboard by Brand & Model or use the online advisor tool

PC2100 is fairly rare nowadays but good thing is PC3200 or PC2700 is backward compatible with your machine. Also the more the better, you will get a better running system also by adding matched pairs and in size like 2x 512MB = 1GB and not 256MB + 512MB

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