That processor had me scratching my head for a moment there, I forgot that they released a new 45nm E6300.
To answer your question about voltage, people say not to put more than 1.4-1.45V vcore through these chips, as beyond that they suffer from degrading clocks over time. So you've got a bit of room there.
As for temperatures, realtemp is the one which you want to trust.
hes on about speeds not temp theres only 1c in between the two. it prob a bug mate as long as the maths add up in the bios nothing to worry about