How much ram can my iMac take?

Hi all, just bought a iMac a few days ago and I'm just wondering how much ram can it take as I want to upgrade it. It didnt come with a manual, so I don't know.
Here's the spec so far
Early 2008 20"
Processor  2.4 GHz Intel Core 2 Duo
Memory  2 GB 667 MHz DDR2 SDRAM
Graphics  ATI Radeon HD 2400 XT 128 MB
Software  OS X 10.8.2 (12C60)
Thanks for any help in advance

There are two answers: the official Apple answer and the "you're on your own" answer.
1 - For the official iMac max RAM, see iMac Memory specifications and upgrades
2 - For the "your're on your own" answer, everymac.com has a list of the Actual Maximum RAM you can put in every model Mac.  In many cases this is more than the official maximum RAM.
After deciding how much RAM you want to put in your iMac, I suggest going to Crucial.com and use the memory advisor or system scanner to see what RAM modules are compatible with your iMac.

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