I've been using the 20pin Antec 550 with this board for over 3 months and it works great, you just leave the 4pins nearest the chipset fan open on the mobo connector. Antec also makes a 24pin model it is the 550 EPS, with this one I think you have to split the 6pin AUX connector into 4pin and 2pin because the mobo has a 4pin AUX.