Thanks man yeah I find the vddci to be static on Polaris unlike Tonga. It's 900mv all the time.
Maybe you picked up an RX 480 8GB we could figure out how to increase vddci to 1000mv rather than 900mv? More overclocking I'm sure.
Dell Precision T7500 : Dual Xeon X5675 @ 3.536Ghz X 24 Threads : 48 Gigabytes : Cinebench R15 : 1505 : AMD R9 390X 8GB @ 1173Mhz 1350mv 57599 Power Limit @ 1250Mhz memory error free on tight timings / since 1500mhz+ had errors galore