Yeah it would be a lot more silent with an Intel CPU, go buy one, don't even need a fan on it but it will be a tad slower than a 486.
No joke, you can try intel with a nice silent fan. In my box it's the powersupply making the sound of a F-16 powering up for take off, the other 5 fans you can't even notice.
Make sure it's the CPU fan before spending money and realizing it that it's something else.
<font color=red>Handsome A7V133 looking for long term relationship with a XP CPU. Prefer non smoker.</font color=red>