[NAME]  the Dell T1700, 3020 7020 9020 power supply is 8 pins instead of the 24 pin.  HOWEVER the number of pins is NOT an indication of where it goes.  Dells power configuration is proprietary not standard. EVGA 700BR used along with Moddiy CAB 359 adapter works fine.  GPU and CPU connectors are  6+2 8 pin for video and  4 + 4 pin for cpu. Neither of those are correct for the 8 pin on a 9020 motherboard. moddiy OptiPlex 9020 PSU 24 to 8 Pin EVGA 700BR  Beware of Fake units that seem to be less than $80 aka counterfeit fake psu. [URL] Retail  EVGA 700BR Best Buy      
I’ve been researching to build a custom optiplex 9020 and I am interested in using this power supply. Can I use one of the 4 + 4 cpu power pins to power the motherboard, and the other 4 + 4 pin to power the cpu? 
Custom Optiplex 9020 PSU