I think it has a lot to do with where you place it. If it's under your desk the sound is going to radiat out like in an ampitheater. If it's on top of the desk next to you it's going to be right in your face. Mine sits on a shelf to the side of my desk, the face of the computer being parallel with the front of the desk. Most of noise is reflected away from by the side of the desk.
I don't ever find it noisy though except when I shut it down and immediately start it back up. Then the fan runs at high for a second. Normally though I can hear all disk activity over the sound of the fans.
This is on a Dual/GHz/DDR Powermac and yes I do a lot of multitasking and gaming I know what the fans sound like with they step up a notch or two. Even then I don't consider it excessive and can still hear the OEM hard drive.
I don't ever find it noisy though except when I shut it down and immediately start it back up. Then the fan runs at high for a second. Normally though I can hear all disk activity over the sound of the fans.
This is on a Dual/GHz/DDR Powermac and yes I do a lot of multitasking and gaming I know what the fans sound like with they step up a notch or two. Even then I don't consider it excessive and can still hear the OEM hard drive.