It is not any of the fans. You are all missing the point. I have been running Calibre like this for months without issue. Since going to version 0.7.57 then 0.8 I have had this issue. Once I upgraded to 7.57 Calibre the noise would start at night some time after starting downloading of 33 newspapers/magazines. I have shut off MSE and know now that Calibre is doing this. I built this computer and the fans are not the issue. Originally this computer had an Athlon 64 3500 cpu and had never a single problem or noise EVER. Only after upgrading to the dual core 4200 (thoughtit would be better) did I have this problem. I believe something is wrong with the way the cpu sets tasks when asked to do intensive work. Downloading news thru Calibre was never considered by me before as intensive. I have watched the heat on both cores and even when the noise starts they do not exhibit large heat spikes.
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