the first one, if this is not a older cpu in a newer mainboard(some mainboard with older cpus not supported can do this, i had one), you have enabled cool and quiet which makes go slower the cpu and saving some energy, also makes the fan go slower or maybe you have some cpu stepping software running?
the dell one, that is the real speed, some cpus run slower than expected sometimes is just 1 or 2 mhz but you have 8 but for 8 mhz i wouldn't be worried
the amd and dell pentium M laptop, this is a cpu stepping saving some power together with cool and quiet
this is the way a laptop saves power when running on batteries, by lowering speed of as many parts as possible
nice turtles
