How to place 2nd GPU & 2nd PSU question

dfreakddfreakd Member Posts: 4
I am currently mining on my desktop PC (specs below)
I want to add a second GPU but my power supply might not be sufficient, but i do have a second power supply Seasonic M12II 620W.

If i were to add a second GPU through a PCI-E riser, and use my second PSU on that card, would that be a bad idea?
And how should i position the 2nd GPU? Since it might not fit in my case.

PC specs
Sapphire Radeon NITRO R9 390 8G with back plate
Intel Core i5-4570
ASRock H87 Pro4
Cooler Master CM 690 III Closed
Crucial Ballistix Tactical 2x 4GB
Samsung 840 EVO 250GB
Cooler Master V850


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