No, whisper quiet. However, I did purchase a second hand TiBook, 550MHz I think, last year. After starting it up I decided to sell it on. It was noisy.
mine sounds like it's wurrling. It's quiet while on the battery, and even the CPU fan is quiet to some degree. It's just that right side fan. I do believe the first sets of Ti's are said to be way nosier than the last set, Though that's hard to comprehend while I'm sitting in my quiet room when my Ti's fan kicks on.