400 watt power supply?

i have a 400 watt power supply i want to know if i could put another 80mm fan in my tower

ive got running a

pcchips p23g v3.0
intel celeron d 351 3.20ghz soon to be core 2 duo
1gb ddr2 533mhz ram
250gb seagtate hard drive
nec cd/dvd rom
lite-on cd/dvd burner
1 80mm led fan
1 led light
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