Assuming it's a SeaSonic M12II like I suspect, yes.
Store im going to doesnt sell the M12II (That was my first choice)
Its this: http://store.antec.com/Product/power_supply-high_current_gamer/HCG-520M/0-761345-23863-2.aspx --- It's not like the buyer just swipes a credit card, puts the employees under their arm, bows, and walks out of Index HQ. - Kromlech06
The non M is based on the S12II, which has a modular counterpart, the M12II. It would make sense that the 520M would be a M12II. --- Want that Shield! Ball and Cup on ps mobile has framerate issues. -stargazer64