Motherboard Monitor versus Asus Probe

I'm finding that Motherboard Monitor and Fan Speed software give different
CPU temperatures than Asus Probe on an Asus A7V8X-X board. Basically, the
Motherboard Monitor and Fan temps are considerable lower than Asus Probe -
about 5 degrees F. The motherboard temperatures are identical in all three
pieces of software.

I've used the config wizard for Motherboard Monitor, and the preset config
for the Asus board. My guess is that Asus Probe is using a different
setting of some sort.

Any opinions on whether the Motherboard Monitor and Fan Speed CPU
temperature readings are more commonly used than those from Asus Probe?

Thanks in advance,

Matt C