Ok so during BIOS init a Intel CPU has encrypted microcode loaded into the\nCPU. That microcode depends on exactly which CPU model is present.\n\nDoes that microcode load happen during Ctl-Alt-Del?\n\nDoes that microcode load happen during reset button or only at power-up\ntime?\n\nDoes which microcode version page?/module? gets loaded also depend on CPU\nstepping?\n\nDoes the BIOS that one flashes to the mobo contain all the possible CPU\nmicrocode pages?/modules? for all the possible CPUs and all the steppings\nthat the particular motherboard can handle OR does it depend on what CPU is\nin the mobo's socket when the BIOS is flashed?\n\nDepending on the answer, might it be a requirement to flash a mobo BIOS\neach time the CPU is changed and/or might that imply that there are a whole\nbunch of different microcode pages?/modules? within the BIOS and accounting\nfor much of its size?\n\nWith respect to the SP2+Prescott+865/875 issue the reason for the ambiguity\nabout whether CPU revision=7 or =8 is needed has been apparently answered.\n=7 is sufficient for Prescotts of a given set of steppings and =8 is\nsufficent for other steppings of Prescott CPUs. =9 microcode is present in\nsome BIOSs.