Can i use 4gb of ram after 10.6 upgrade on MA589LL?

Hello, I am new to Mac.
I have a late 2006 iMac (MA589LL) that I have upgraded to 3GB of RAM. It has 10.4.11 on it but i have 10.6 in the mail. The specs say that it is limited to 3GB of Ram but it also says that the hardware will support 2 x 2GB sticks but the OS will only use 3GB. I am assuming that this is due to 32 Bit OS. If I upgrade to 10.6 or even 10.7 will that give me the 64 Bit OS and allow me to utilize the full 4GB?
Thank for any help and suggestions to a new Mac user,

Here are the complete specs for your model:
http://www.everymac.com/systems/apple/imac/stats/imac-core-2-duo-2.16-20-inch-sp ecs.html
Upgrading to 10.6. or 10.7 will not change the fact that it will only address 3 GB; personally, I'd stay with 10.6 because Lion is somewhat of a memory hog and 3 GB will be stretching it - you will not be happy with the performance. From what I've read, yours can read 3.1 or 3.2 GB if you install 4 - I used to have the same (but 24") model and stayed with 3 GB. And that will not change by installing Lion.

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Can i use 4gb of ram after 10.6 upgrade on MA589LL?

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