4th GPU Hashrate Fluctuates

Hi guys,

Im using Claymore's dual gpu miner with 4 STRIX RX 580, but my GPU3 hashrate fluctuates a lot, from 4MHS to normal 25MHS, does anyone know why? Im using 17.4.4 amd driver btw.



BTW does anyone have ASUS STRIX RX 580 modded bios? cant quite find it in the forum.