I think my Q6600 has a faulty (stuck?) sensor on core 3. Whilst the others show the temps correctly, core 3 seems to be stuck at 58. Even when just switched on and the others are at the low 30 mark. I've read about others which consistently report 10-15 degrees higher, but none which report the same temp all the time.
Is this a sign of impending failure, or is it nothing to be too concerned about?