How much watt is my power supply unit?

vrjdude94

Honorable
Jul 23, 2013
14
0
10,510
Okay,so i opened my cabinet and i this was written on my psu- (ac input) : 100-127V~/200-240V-50/60Hz,8/4A

(dc output) : +5V-16A(red)+12V-18a(yellow),3.3V-16.7a(orange),-12V-0.3a(blue),+5VSB-2.5a(purple),pg(grey)

(output watts) : 280W at 25°.Dereted at 1.2W/°C to 250W at 50°C=5V&+3.3V:135W at 25°C,120 W at 50° C

Is my psu of 280Watts?,i want to install an hd 6670,will it be able to handle it because hd 6670 requires 400W psu