Sandor, The Mac OSX System Profiler cannot tell the difference between between PC100/PC133 and reports everything as PC-100. Boot under OS9 and run the 'DIMM First Aid' and it will tell you what's really going on. The freeware,DIMM First Aid only runs under OS9, it was never updated to OSX and I do not know of a better utility to check your memory. Dick If you don't have DIMM First Aid, drop me a note and I will send it to you. > From: sr ferenczy <srf7425 at rit.edu> > Subject: Re: [G4] PC133 or PC100 RAM? > Message-id: <8D85C023-53A2-11D8-B533-00039351C4CC at rit.edu> > > in my QS 867, all 1.5 GB of my PC133 is reported as PC100. im really > not sure why, but since everything works fine, i dont worry. > > sandor