I first got suspicous looking at identical, and unual specs.. I mean 45A 5V and 28 12V are unusual but indetical between OCZ and epower/tagan. Look at both companies whole lineups.. same specs bewteen the two down the list from Powerstream 600 to lowest one. Then I heard about it reading this review and looking at pictures of both inards which were identical.
http://www.silentpcreview.com/article277-page2.html
Then I did a google search of OCZ and epower, or OCZ and tagan and was inundated with matches saying the same thing. both in forums and in on-line media.
Like this guy
http://www.phoronix.com/vr.php?view=5081
""OCZ Technology has been near the top of the power supply hierarchy for quite a while now. Nevertheless, it is a well-known fact that they, like most manufacturers, do not actually make their own units. OCZ Technology uses Topower's as their OEM supplier. Some of the other companies that benefit from Topower include Athena Power, Globalwin, BeQuiet, Aerocool, and ePower. Today we have ePower's Silent Engine 570W PSU for review and it uses Topower's power supplies."