I have an audio studio PC which runs in my bedroom, it is very loud and I hate it, it seems like most of the noise is coming from the Power Supply which is a: COOLER MASTER Real Power Pro RS-850-EMBAD1-US 850W
I am not much into gaming, so stability and low noise are most important, my current build has the following specs.
Coolermaster Cosmos S case
Core i7 2.93 overclocked to 3.2ghz
Coolermaster V8 CPU cooling
6GB Corsair Dominator RAM
Asus P6T Deluxe V1
COOLERMASTER Real Power Pro 850 WATT PSU
3 x 500GB RAID (0+1) via Adaptec 5805
1 x Optiarc BluRay Player
1 x LiteOn DVDRW+/- Drive
1 x NZXT Fan Controller
1x MSI RADEON HD5770
1xPCI Firewire 3 port Card
5 x Silenx 120mm Case Fans.
Another option is to crack open your existing power supply and replace the fan with a silent one. I have done this a few times. Not exactly ideal from a warranty standpoint, but you have plenty of power available with the existing CoolerMaster. The fan is the problem...