One's at 19 the other is at 28. I have a feeling the 19 is under-reporting, as that fluctuates between 3-4C's - even at idle, for no reason.
Both of my E8400's had one "jumpy" core, with the idle temps fluctuating up and down constantly. Other posters have noticed this also. Seems to be a normal anomoly with these Wolfdale's. My first E8400 was 17C/34C at idle, it's replacement is 38C/38C at idle with the exact same settings, but one core does flicker up and down from 38C to 32C, for no particular reason.