The Vnf4 will (3 as well for that matter) needs an 18 amp 12v rail minimum. Since it's a 24 pin, I would recommend a ATX 2.0. spec, The easiest way to search at newegg is for dual 12v rails,
http://www.newegg.com/Product/Produc...82E16817103499 is the minimum I would get. Basicly a fortron with Sparkle name.