Mostly what i seen in some tutorial in youtube you can use the pcie to 2 gpu this is just what i watched from the youtube tutorial like video from voskcoin
But honestly never tested yet because in my own miner i use only 1 cable per gpu for safety. .
You can use CPU power connector from one of your PSUs to get 2 more PCIe power connectors with special splitter cable (price is about $5 on ebay).
can you post a link to this?
will the 2nd power supply still be able to be connected with the dual power supply splitter cable?
You can also get it in amazon but $6 each .. check it here
https://www.amazon.com/JBingGG-Graphics-Splitter-Express-Connector/dp/B076D7Q147/ref=sr_1_7?ie=UTF8&qid=1518431358&sr=8-7I think for 2nd power it would be ok if you use it to power your GPU but i heard a lots of problem about performance and other issue about connector could melt too fast But you can try it if your connector is getting hot just remove it because honestly its not recommended if you really running 24/7 miner..