CPU cooler sound

Yesterday my CPU cooler was making a lot of noise so I took it to the service. They replaced it with another one and told me they put some kind of paste there, so that it works better.

It works fine now, but it constantly (while it's on all the time) makes a very very low hissing noise around that same area. I'm not sure if that's just how this new CPU cooler sounds or if it's from the paste of what. It's not getting overheated or anything, everything runs smoothly. Do you know what this could be?
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  1. The paste is between the cooler and the processor . Its a thin layer to conduct heat .

    You are probably hearing the sound of the cooler .

    Your motherboard may let you adjust the fan speed down in BIOS , to cut noise , but make a note of the temperatures too and try and stay under 60 C
  2. I downloaded Core Temp and the temperature is always around 31/32C, I check regularly.

    How can I adjust the fan speed in BIOS? I have Windows 7, not sure how it works!
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