CPU fan making noise

Hi,

When I start my computer, even when i start some game and start playing it just starts making noise.That noise isn't big, but seems like there's some problem. My processor is AMD Athlon 64 X2 4000, arctic-cooling (CPU fan) and some Power Fan. CPU fan shows 927 RPM. I have asus probe soft. and it measures the speed, btw. m.b - asus) and P.F. shows 8700 then after a few secs goes to 8300 then 8000 them little lower, but usually it spins at 8436. I haven't noticed those speed jumps earlier.

Should i get another cpu fan??

When you say Cpu's fan is making noise, I am wondering, is this something new? Does that noise has become so much unbearable?

It makes sounds due to cpu heat up, the fans speed up causing
more noise. There are noiseless fans out there which are, from what I'm told, very quiet even under full rpm. I think this would be your best solution.