Re: power supply
There is a good power supply calculator here: http://www.extreme.outervision.com/p...ulatorlite.jsp
For the second question I don't quite understand what you mean. Do you mean that if the PSU fails, could you lose data? I would have thought the answer would be no.
AMD Phenom II X4 955 BE @ 4.0GHz + TU120E lapped - MSI 770-CD45 AM3 - 2x2GB OCZ DDR3 1333MHz - Sapphire HD 4870 - Samsung Spinpoint 500GB 7200RPM 16MB cache HDD - Tagan TG600-BZ Piperock - (Currently open test bed) - Windows Vista Home Premium 64bit.