Hi all, I would like to know how much additional RAM can I add to my imac which has been running inefficiently. My imac is bought in 2008 and the spec is included in the attached files. My friend told me that it uses DDR and the max that I can use is 2GB, which mean I can only add 1GB to my mac. Please let me know if this is correct or if more can be added. Thanks in advance.