Now I'm starting to wonder. Can't I run my 1,2GHz at 133MHz x 9 ? Do I have to run it at 100MHz x 12 with my RAM also at 100 ? Now I'm running RAM 100, CPU 100x9... because I had some problems, haven't tried after I reinstalled Windows. I've had a lot of trouble with ATA-100 too. No help yet in Mobo and Technical Support forums. Help appreciated 