pc makes noise on overloading

hi friends, I am using windows 7 with these specs - p4 processor, 1 gb ram, intel dg31gl, 2 dvd drives, 80 gb HDD.
Well, my problem is that I play need for speed most wanted and when I launch it, my pc starts making noise and the noise seems to me that the fans start rotating at faster speed. so on this basis, I have drawn conclusion that since nfs most wanted is a heavy game for my pc specs so the processor is overloaded and fans (to cool the case) make extra rounds.

Please tell me if i am wrong and is this noise on overloading serious? please tell me guys.

Thanks in advance.

 

Dear Halo. thanks for the quick reply. My pc doesn't shoutdown or does nothing of this kind, it just makes noise when i play nfs most wanted and as soon as i quit it, pc becomes normal. Now i am feeling quite relieved as you said that "unless you are gaining random shutdowns and crashes I wouldnt worry too much for now"
I will surely post all the temps recorded by HWmonitor in some time.

Thanks for the help.