I am looking into buying myself an original iMac, and I want to mess with the older system a little bit.

iMac G3 image from Wikipedia

Also, is it even remotely possible to change the RAM in the system to being over 256 MB. I am willing to do it even if it means changing out other parts to allow it to be possible.


2 Answers 2


Apple reports that this model can support a maximum of 128 MB of RAM. However, the "revision A" model "unofficially" can support a maximum of 384 MB of memory (one 128 MB and one 256 MB module) and the "revision B" model can use a maximum of 512 MB of memory (two 256 MB modules).


The maximum amount of RAM that the iMac G3 could accept was 384MB for the Rev. A model and 512MB of RAM for the Rev. B model.

This was done with a 128MB and a 256MB module or two 256MB modules of 144pin PC66 RAM, respectively.

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