Phenom II x6 1055t 125W cpu fan loud?

OK, so sometimes my Phenom II x6 1055t 125w stock fan gets really noisy, even at idle, I’ve checked the fan/heat sink for dust but there isn’t any, i can tell that the motherboard is controlling the fan because the noise varies from what i do. sometimes even with the air con on.here are some information on the fan and heatsink:the heatsink has a copper base with 4 heatpipes, the fan is an AVC 0.7 amp PWM 4-wire fan with a built in tempsensor (i have no idea why it needs a temp sensor since its PWM.)
i havent overclocked it. and the air circulation is good as well

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