I just got my new PSU yesterday and am done installing it, I got the Corsair AX-1500i.
When installing it i called Corsiair to ask them a question and the guy asked me why I needed such a big PSU and I told him. He then went on to say that I didn't need that and whoever told me that I needed This doesn't know what they are talking about , in reguards to single rail or multi rail . Haha i just laughed at him and hung up.
Anyways I am going to test now .... stay tuned !