Quote Originally Posted by new-b
If the multi is changing from 9 to 6 and back, that is actually C1E....
You could use "RightMark CPU clock utility" to check if C1E (or EIST for that matter) is actually on. The program can also be used to turn it off at windows start up as a kind of workaround, that's what I use on my BA1 since there is no option for C1E in bios.....with c1e off, the multi stays steady.
My bad. You're correct.

Extended HALT Powerdown State
Extended HALT is a low power state entered when all processor cores have executed
the HALT or MWAIT instructions and Extended HALT has been enabled via the BIOS.
When one of the processor cores executes the HALT instruction, that logical processor
is halted; however, the other processor continues normal operation. The Extended
HALT Powerdown must be enabled via the BIOS for the processor to remain within its
specification.
The processor automatically transitions to a lower frequency and voltage operating
point before entering the Extended HALT state. Note that the processor FSB frequency
is not altered; only the internal core frequency is changed. When entering the low
power state, the processor first switches to the lower bus ratio and then transitions to
the lower VID.
While in Extended HALT state, the processor processes bus snoops.
The processor exits the Extended HALT state when a break event occurs. When the
processor exits the Extended HALT state, it first transitions the VID to the original value
and then changes the bus ratio back to the original value.
EIST does the same thing but it has to be initiated by the OS.