I currently Have a: Dual 1.8 Ghz PowerPC G5 Memory: 1.5 GB DDR SDRAM I am a Mac User and in no way an Expert.. My G5 is the Power behind my home studio and I am looking to Upgrade the G5.. I understand about updating the Ram and getting matching Pairs and even have the Chart from Apple Support.. Anything else I need to know? Also Can I increase my processor speed if so how (link)? What can be my max speed? recommendations? Anyway to Update to a Quad over the Dual any reason why I would need to or not need to?? Also looking to add more USB inputs into my G5. I am leaning more towards PCI (if available) as I am not sure what Hubs can handle and I am needing to Plug IN Audio Interfaces and Synths.. Thanks in Advance..