X-bit Labs has taken a look at 9 power supplies from Topower:
Topower is a popular manufacturer. Besides making a wide range of PSUs for such brands as Tagan, BeQuiet, Mushkin and OCZ, the company is promoting its own brand, offering boxed PSUs of varying wattage and functionality.
Topower’s product line consists of a few series, or generations, of power supplies called P5, P6, P7, etc. The series number is indicated in the PSU’s model name. For example, the TOP-1000P9 U14 model belongs to the newest P9 series (the bigger the number, the newer the series is). Besides that, there is a small number of "proper-name" models (for example, Silent Green) for which the series number is not indicated explicitly.