256mb RAM

I have 256mb RAM, it is too slown as you can Imagine...I didn't know ...
1) how much ram does the operating sistem that came with the mac take...?
2) I would like to change it to more ram:
a) can I ad ram to my 256 or do I have to get a new one of 512 or 1gb?
b)how much would it cost me512or 1gb?
c)can I order it in the apple store and put it in myself? (PS: I don't care if that takes me off the one year garncy because I bought it in the US and I live in Italy)
thank you.

Tiger doesn't require a specific amount of RAM - it generally tailors use to the amount available. The less RAM installed in the system the more it uses virutal memory, an area of the hard driver set aside for 'pages' that MacOS moves from real RAM to virtual store and then back again. Since access to data on the hard drive is slower than from memory, this means that the less RAM the system has installed, the slower it will tend to run because more of what MacOS needs will come from paged store on the drive than from RAM.
How much memory you need depends on what you're doing. Most users find 512Mb entirely satisfactory, but if you're using applications such as Photoshop, more would certainly be better.
You can't 'add' more memory - the mini has only one RAM slot, which means that the stick you have in there at present will need to be removed and replaced.
Since you're happy to do the RAM install yourself, you might try looking at www.crucial.com or www.newegg.com for RAM prices - from such sources a 1Gb stick would cost little more than an Apple-sourced 512Mb module. Just make sure that whatever supplier you buy from will exchange the RAM if you have any problems with it.

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