Ok, I actually have a Enermax 300 Watts power supply that I bought 3 months ago to be ready to upgrade my processor to a Athlon XP 1600+. In about one week, I'll buy the processor and I don't want to change my power supply. Then I was asking me if my Enermax 300 Watts power supply was enough to run a Athlon XP 1600+. Somebody said me that is was enough. So, what do you think? Thanks to anybody who will help me!