The RM650X will provided enough pcie cables for a R9 390 to use.
You are given four 6+2 pcie connectors to use. For a single R9 390, you will need at least two 6+2 connectors.
The RM650X will provided enough pcie cables for a R9 390 to use.
You are given four 6+2 pcie connectors to use. For a single R9 390, you will need at least two 6+2 connectors.
A Radeon R9 390 needs 30 amps on the 12 v + rail and a 550 watt to 600 watt power supply with 2 - 6 pin PCIE power connections , The Corsair RM650x exceeds the requirements , it's a good fit.