After reading Apple's technote, it would appear the G5 can be upgraded to 16 GB of RAM. Since this contradicts Apple's specs, I wrote the developer site contact link to ask that a revision be made: Technote's http://developer.apple.com/technotes/tn/tn2087.html bottom line of the G4 G5 comparison table says the G5 can address 16 GB of RAM. Yet http://www.apple.com/powermac/specs.html says it can only address 8 GB of RAM. Websites like this one: http://www.pricewatch.com/1/33/5550-1.htm show that 2 GB memory modules exist that meet the specs of the machine, and with 8 slots, you'd think the G5 could possibly be taken up to 16 GB. Is the 8 GB limitation hardware or software? And if hardware is it only because you don't yet sell the 2 GB memory modules, or is it because the controller itself can't address more? If the controller itself can't address more, I think the technote: http://developer.apple.com/technotes/tn/tn2087.html should be revised to say only 8 GB of addressable RAM.