Seasonic has been making high-quality power supplies ever since they hit the market two years ago. Not only is their new X-660 660W power supply 80Plus Gold rated, but also comes with a quiet fan. The PSU?s fan does not kick in till the user reaches 20±5% load, and it maintains a 16dB(A) acoustic noise level until it reaches 50% load. From that point on the fan speed begins speeding up, still maintaining low acoustic noise. The Seasonic X-660 750W power supply is also 100% modular, which makes it very easy to install and prevents large cable messes from accumulating."
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips