it should be a rf choke:
A choke is an inductor designed to block (have a high reactance to) a particular frequency in an electrical circuit while passing signals of much lower frequency or direct current.
just my two cents: I think people forget reason we really choose the high wattage power supply, it is for the high current output ability, for example, I have a corsair 520 watt supply, and my pc only need 250 watt on 3d mark 6 test( cpu and video card on full load), but same test will crashed...