upgrade 300w psu for 3 fans?

Hi, I'm new to nearly everything pc... console gamer until now.
Anyhow, i was just about to add 3 fans to my pc (only fan was on psu and cpu!) and i was curious as to whether it would run fine with the 300w supply it came with, or whether the 3 fans (2 92mm and one 60) would suck too much power from other components.

system specs:
amd 1.4 athlon
512 mb ddr ram
geoforce 2 64 mb (no cooling on it either)
60g hd

It depends on the quality of your power supply. My cheap 300Watt does ok with extra fans and an Athlon @1.4. Overclocking is not so good, though.

cool thnx... mine is cheap... good u just saved me some $$$