All 45nm CPUs like the Quad you're looking at have sensors that might stick and not report accurate temperatures below 50C. That's just the nature of the sensors that Intel used since they were designed for thermal throttle and shut down control and not for accurate core temperature reporting.
The good news is that the Core i7 will be out later this month. I've heard two weeks from today, November 15th, but that's just a rumor. Their temperature sensors seem much better during early testing.
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