Further to my original post; I read my MOB manual (QDI, jumper emulation in BIOS setup). My board has an auto setup facility which configures the processor. I briefly tried over-riding this to over-clock my P233 to 266. It did work, but I changed it back as there is advice in the manual that the associated MOB chipset will not be reliable in these circumstances. So, beware, it may do more damage than just overstretch the main processor
