I originally posted this in the news thread having done a search but I think that is the wrong place so please forgive me for starting a new thread. I'm currently weighing up the two options of building my own Linux/Windows workstation and buying a Mac Pro with student discount. I'm curious as to why 4GB unbuffered modules are so much more expensive than 4GB registered modules of otherwise the same spec for example Crucial UK prices (which are presumably much more than say OWC US prices are) Unbuffered for Mac 12GB (3x4GB) kit of 1066 memory is £1,277:44 inc VAT whilst registered ram kit is £407.09 both are the same spec apart from being registered or unbuffered and both are 4GB modules. It is strange because registered memory is normally more expensive. Also many mother boards (such as Intels) take either registered or unbuffered (but not both) so has anyone tried registered memory in the Mac Pro??