Running 5GPU's one hash rate is really low

[benbrook1980]

I'm currently running 5 GPU's 3x RX580 1xRX480 and 390X the rig is doing around 3140h/s but one of the cards is only hashing at 280h/s. I thought this might be an issues with the card/riser but upon taking the card out and re-compiling the config file another card will drop into the 280h/s barrier. Has anyone got any ideas as to what it could be? Doesn't seem to matter which card gets pulled as one of the other cards will always drop to 280h/s

I'm running windows 10, 8gb ram XMR-Stak AMD 2.2 Latest AMD Drivers (390X doesn't get recognised by the block chain drivers) amd.txt config.txt cpu.txt