Its just two of those rx580 so the 650watt power supply is more than enough for every algorithms that you want to mine, on ETH those cards takes 80watts each = 160watts and on ravencoin those cards takes up to 120watts each = 240watts, still not even close to the half of 650watt power supply.
You are wrong. This cards need 120w for ETH - you can´t use the software reading for this - AMD only show the TGP in every software - so you must add around 30-40w to every card.
Example - Teamredminer show 530w for one of my RX570 rigs - from the wall it is 880w.
Same for Nvidia, but here you must only add around 10 - 20w per card to the software readings.
Yes i know no one will hear this and no one will trust to my words, it is so annoying that so much people don´t trust to my words every time. But you lie to yourself if you think such software readings are the truth.
This is the truth. If OP is that spooked about wattage get a Killawatt
get from the wall readings. Run algos, note wattage pull.