pretty sure the amp is still of reference design
"Being a copy of the reference card, the Zotac has a seven-phase power circuit governed by a popular Volterra VT1165MF controller. One 6-pin and one 8-pin connectors are used for external power supply."
http://www.xbitlabs.com/articles/gra...x280amp_3.html
But I think you can breach any OVP from using software to up volts, like on the lightning 275
