Use this guide to upgrade the RAM in your 2007/2008 24" iMac to a maximum of 6GB (2GB+4GB).
iMac 2007/2008 24" RAM Upgrade Guide (iMac7,1 / iMac8,1)
Use this guide to upgrade the RAM in your 2007/2008 24" iMac to a maximum of 6GB (2GB+4GB).