Among all the parts in the computer, the power supply is usually the part that people give the least thought to, which is perhaps not so strange. After all, it does nothing but supply the computer with power, so how interesting can it be? What many people don’t realize is that a weak power supply can cause instability and cause the computer to crash.
On the new eXtreme PSU Calculator web service, you can enter your computer’s processor, hard drives, fans and graphics card, and then specify how large a power supply you need to power all components without interference. A service that will attract computer builders.
Source: Lifehacker.