[Prasman]

google:

Q: What is Vccp2 (and sometimes +2.5V) supposed to be?
A: Any number of things. If the monitoring chip supports this reading then
MBProbe simply reports it. Only the motherboard manufacturer knows what it
could be. It could read:
o Similar to Vccp1
Dual processor boards have one reading for each processor.
One exception is the Abit BP6 where 'Vccp2' is a 1.5V (Vtt) reading
and the real Vccp2 is the Vbat reading.
o Same as Vccp1
On my (uniprocessor) Asus P2B, they're both the same.
o 3.3V
The Intel VC820 seems to have Vccp2 connected to 3.3V.
o 2.5V
That's what the +2.5V reading is supposed to be.
o 1.5V
Some boards (Intel, QDI) have Vccp2 or +2.5V connected to Vtt instead
which has a nominal voltage of +1.5V. Adjust the nominal voltage in the
voltage tab accordingly. Vtt is the AGTL+ bus termination voltage.
o Some weird value
The Tekram P6B40-A4X connects the Vccp2 input to a thermistor instead
and as such gives a nonsensical Vccp2 reading. Disable the warning for
it and select "Tekram" for the CPU temperature.