amigakit is correct, take the power from the floppy power connector (you'll need some y-adaptors). Mine works fine with an a500 p/s but a goliath or bigfoot would be better. No power problems with 500 mb 2.5 inch ibm h/d, 24x teac cdrom, Winner 4-way adapter, apollo 1230/40mhz w/ 32mb simm and silversurfer on the clockport. Give it a try before you cut/modify your case top cover.