Thanks to both of you for your replies. I would tend to agree with the assumption that Overdrive is totally wrong. Yes, I'm going to stick with CoreTemp. I just wish AMD processors had individual core sensors like Intel instead of a single temp sensor for the CPU package. And as far as the break-in period, Arctic reports 200 hours of heat and cool cycles... less if one tins the surfaces first. So, yes, a year would be about right. Thanks again.