Hi, [newbie alert] I am expanding my rig where currently one EVGA 1200W PSU will power 5 RX580 Armor 8GB OC cards plus all the MB connectors.
I have followed the illustration on the Asrock minisite https://www.asrock.com/microsite/H110ProBTC+/ step 4 for the second PSU, an EVGA 800W PSU, using one of these dual PSU extension cables https://www.amazon.co.uk/gp/product/B078SPPXLL/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1
With the second PSU connected to nothing else other than the PSU extension cable, the system will boot. When the Main 1200W PSU is turned on, I can hear the relay click on the second 800W PSU and the fan starts.
When I connect the second PSU to a single PCI riser and the 8 pin connector of the GPU card and turn on PSU1 the machine won’t boot. When I plug in the USB cable from the PCI socket on the MB to the riser, it also won’t boot.
I have swapped out PSU2 for a spare and the symptoms are the same. As there are plenty of examples of using this MB and others with more than one PSU and the configuration is shown on the Asrock website, I know I’m not trying to do something that wouldn’t work.
Any pointers to how to trouble shoot this? TIA.