You have to use an EPS Power supply and it needs to be 750W or more.
Needs to be an EPS12V 2.91 NOT ATX 12v 2.0
Newegg.com - Antec High Current Gamer Series HCG-750 …
www.newegg.com/.../Product.aspx
Buy Antec High Current Gamer Series HCG-750 750W ATX12V v2.3 / EPS12V v2.91
EPS12V Power Supply Design Guide, v2.92
Nathan Kirsch. Skyhawk PSU ATX12V & EPS12V Compliance. Legit Reviews. "On the front of the box it says "Triple Rails for +12V" and then goes on to say 'Intel ATX 12V Version 2.0 & EPS 12V Version 2.1". It turns out from our investigation that the above power supplies do not meet the ATX12V or EPS12V standards as the packaging claims."
Note The DELL has 3 Rails 16 amps 16 amps and 12 amps Which Would be 44 amps at 12V which is 528 Watts.
130 Watts more on the 5v/3.3v Rails means 628 Watts the Supply says 475 W but its under rated rather then exxagerated like many 525 to 650w power supplies are.
