The iMac is Apple's line of all-in-one desktop computers.

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What is the highest OS X you can upgrade this computer to?

iMAC OS X 10.3.9 is what is installed currently.

Which version is the highest you can upgrade to and do I have to add more memory to do this upgrade?

Currently the computer has 512mb of memory and is a 1.8GHz Power PC G5.

I do have another slot to add memory if needed.

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This is probably your machine from the info you have provided:

Apple iMac G5/1.8 20-Inch Specs

Identifiers: iMac G5 - M9250LL/A - PowerMac8,1 - A1076 - 2008

Pre-Installed MacOS: X 10.3.5 (7P35)

Maximum MacOS: X 10.5.8

RAM Type: PC3200 DDR Min. RAM Speed: 400 MHz

Details: Supports 400 MHz PC3200 DDR SDRAM. If installing RAM in both slots, use matching memory for best performance.

Standard RAM: 256 MB Maximum RAM: 2 GB

RAM Slots: 2

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Thank you for this info. That is what I needed.

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