Reducing rpm on my fan gives lower temperature.

I had  a little accident with my volcano9 and had to connect it to the main powersupply. Without any control it ran at full speed and made so much noise that I finally attached the rpm controller that followed with the volcano9. Strangely my cpu has actually gone from 62 to 58 celcius after reducing my fanspeed to an acceptable noise. I tried this several times and if I increase the fanspeed to full my cpu gets hotter.....this is very weird and I cant seem to find any explanation.
Besides the fact that my new volcano9 blew the fanpower on the motherboard I love my msi 6380...never had a single problem with it and it must be one of the best boards ever made.

I would also think that dynamics has something to do with it. While thermaltake has a good fan, they could have done better with the heatsink. All copper would have been a good start, to rival the thermalright heatsinks. I would think the issue is with the heatsink and not the fan as I use the same fan that comes with the volcano 9 (smart fan 2) at full speed and temps are lower than at medium speed. I use the thermalright ax7 heatsink.

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