judge, i think you"re absolutely correct! If thses modules are truly1066, i would think conservatively they should crank up to at least 1150. Initially i was gonna hold off for awhile till i got all the piece parts for my system, but since i started this thread i feel kinda responsible to get u guys some solid facts about these modules. im gonna try to partially put together this system to at least get some prelimiary boot numbers. i gotta a souped up th7ll mb with aftermarket clock generators(533mz). So if i can fire up the mb it sould tell me how good this ram is. Hopefully it is, and you guys can share in my good fortune too... Im gonna try for tonite or tommorow and ill check back... flapperhead