This Supermicro Riser has a 6-Pin connector :
http://www.ebay.com/itm/361581029535?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT
http://www.ebay.com/itm/361581029535?_trksid=p2055119.m1438.l2649&ssPageName=STRK:MEBIDX:IT