• Could you tell me what the chips are that provide the Firewire 800 interface? (I have had two 27" iMacs, one from Oct 2011 and another from April 2012, both of which suffer from finder lockup every week or two when I leave connected two F800 daisy-chained v3 3TB LaCie 2d Quadra drives. LaCie tech support has told me that "some Macs have incompatible interface chips and some don't". I'm trying to learn more about this so that I can identify an iMac that will not lockup sporadically when used with these external drives.)