Overall, the XFX Pro Series 850W Black Edition is not the best performing 850W power supply that we have ever tested, nor the most innovative, or the lowest priced; however, it is outstandingly balanced in every aspect. The overall performance is undeniably excellent, with the PSU easily conforming to the 80Plus Gold certification standards, running silent and maintaining low temperatures, as well as displaying admirable electrical performance. When it comes to quality, the fact that Seasonic is the OEM behind its manufacturing alone should be enough to satisfy even the most demanding of users. The choice of components is excellent, as is the quality of the assembly. XFX covers this unit with a 5 year warranty (parts + labor), which should be enough to quell any concerns...