^ title says it all
Impossible to say without knowing the exact model.
430W this one
Yeah they are good since they are built by Sea sonic (http://www.realhardtechx.com/index_archivos/Page625.htm) and I own an XFX TS model myself and had no problems.
They are built by a subsidiary of seasonic, but there haven't been any professional reviews done so we cant tell you if it is a good unit or a mediocre one.