380W PSU not enough?

[auszombie]

Hi,
I recently bought a coolermaster case which includes a CM extrem power 380W PSU. The PSU is said to have intelligent fan speed controller and super silent but the only noise i can hear from my computer is from the PSU.

My PC is running with 3 HDD, 2 dvd-burners, one 12V fan controller, one 9 cm and two 12 cm fans (on P4 1.6G and a crappy 128 Mb graphic card).

So the question is: is the 380W PSU not enough for my system and thats why the PSU fan is so loud because of high load?
If i change to another PSU (just a cheap one ) like thermaltake dual 8cm fan TR2 430W, would it lower the noise level significantly?

any help is appriciated