I ran the 1260 with the standard 25w psu for some time, but i quickly got an a1200 to atx power cable and taped together a franken psu. But that is a plain a1200, wih a 80 gig hd. I feel safer with 300w. though more noisy. I added two fans btw, one gpu fan glued near keyboard hole, and one larger blowing down in the middle of the amiga. I noticed it got quite hot without. Both fans are on 5v.. Though the gpu fan is 3v so its noisy as feck.