The P4 or ATX2 power supply has two power connectors just like P4 motherboards have... @buletov I had to buy strongest power supply since it has to hold two 80 gigs SATA hd-s, P4 2,8GHz, 2x256 DDR Kingston HyperX, GeForce 3 Titanium 4200, Pioneer DVD-RW +/-, Sound blaster LIVE digital sound card, everything nice settled on my Asus P4C800 Deluxe motherboard and firmly fitted in Thermaltake V1000A Supertower