    What??  Nothing whatsoever to do with anything sata. All 780s use proprietary non standard 24 pin MINI MOLEX [URL] Connector and its not 1 to 1 straight Thru. You can use a regular power supply outside the case and run wires into the hole left behind with the internal power supply removed. [URL]       [IMAGE]EPS12v 24 pin to 760 780 980 etc       [IMAGE]outside case
but is a possible good idea to swap the case and psu for 400w because i need to know if that can damage the motherboard because i need a goodcheap graphics card i need to know?
i have a dell optiplex 780 dt