im asking this because i had a sony vaio with an INTEL PENTIUM DUAL core and it made NO noise
and i just got a brand new acer laptop with an AMD ATHLON dual core and the fan is really noisy?
There are many companies, who supply any manufacturer.
If this fan is significantly louder, see if you can compare it with other laptops of the same model.
If those laptops are quiet, send yours in to be repaired / replaced - fans are made in such high quantities, some faulty units are bound to get through - you may have one.
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