How quiet is your mac mini?

After many weeks of lurking on this forum, I have finally ventured into the mac world for the first time and bought myself a dual core mini (hooked up to a Viewsonic 2025M LCD). It's a beautiful machine, everything up and running in no time. But... it's not exactly 'whisper quiet'. In a quiet room with no music playing, the fan is definitely audible even in very light tasks. And to my ears there is a low-pitched humm or buzz; this is on constantly and only disappears when the mac is put to sleep. Is this normal?

I have to confess, the noise is far less problematic than my previous PC. And if I have some music on or am playing a DVD the noise ceases to be noticeable. But I had high expectations in buying my mac and this is the one thing that bothers me. I did get the RAM upgraded to 1 Gb and am wondering if this could have caused a problem.

Has anyone else experienced this? How quiet is your mac mini?

Thanks for the replies everyone. I don't think the fans on my mini are running on full - when I switch on, they seem to be running at full speed, making quite a noise but then after a couple of minutes they suddenly become much quieter (though still audible). I guess this is normal behaviour.

It's the constant humm or buzz that the mini makes which is more of concern. It could indeed be that I have ultra-sensitive hearing, or maybe it's magnified by my working environment (I have a wooden-floored appartment, no carpets). After doing some searching it seems that over mini owners have reported something similar. So I know I am not alone.

I guess I will get used to it. Using this machine is a very enjoyable experience, and as I said initially, it's still quieter than computers I've used previously.