you sure mate, cos i mean its only a 50 + from mine does it matter ?
Im positive, you cannot compare your PSU to that Corsair..... It's like comparing a Ford Pinto to a Corvette
52A on 1 rail is enough for a HD4890 ... and still have power to spare......
You have nothing to worry about, here is a tool so you can see for your-self.....http://www.corsair.com/psufinder/default.aspx