How much benefit does increasing memory RAM have on the system

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http://askubuntu.com – I will soon have a PC that can handle up to 32GB of RAM (Yeah my dream comes true) but I would like to know, because this is the first time I am jumping the 4GB boundary on a home computer, how much performance increase and general benefit will I have if I use 8GB, 16GB or 32GB for the system. Apart from the huge jump in price I want to see if it's worth buying more memory for Ubuntu, in this case 11.10 but soon 12.04 and how much of a difference it will be. I will be using the 64Bit version of 11.10 for normal activities like: OpenOffice (Max 6 documents opened) Browsing with Firefox/Chrom (HowTos)