How much ram can i max out on imac 20 (2009 model)

*Hi i have a APPLE MB417B/A iMac 20" MB417B/A*
*what ram do i need? how much ram can i get? 4g? or 8g?*
specs are as follows:
With a 2.66GHz Intel Core 2 Duo processor, 2GB DDR3 RAM & NVIDIA graphics, iMac brings you more performance than ever. iMac packs performance inside a stunning all-in-one design. Includes Mac OS X.
* 2.66GHz Intel Core 2 Duo Processor
* Mac OS X v10.5 Leopard - Operating system
* 2GB Memory - Run more applications
* 320GB Hard Drive - Load up on photos,videos
* 20'' Widescreen display - Vivid colours
i'd be greatful for any help...

Hello miss_papaya
That model supports 2 4GB modules for a total of 8GB, only problem is that 4GB modules are currently at a premium price. Have a look at the spec's in the following article or in the User's Guide that came with your iMac.
http://www.apple.com/imac/specs.html
Also have a look at Crucial and OWC memory below:
4GB kit > http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=60D83BBCA5CA7304
8GB kit > http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=1D7DBABCA5CA7304
OWC > http://eshop.macsales.com/shop/memory/iMac/DDR3_2009
Dennis

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