Low hashrate RX 480 - 15 mh/s

[nowampson]

Hi! I start mining on my new rig:
GPU-0 XFX rx 480 8gb oc Reference
GPU-1 Sapphire rx 470 4gb oc Reference
GPU-2 Sapphire rx 470 nitro 4gb oc

And i try to mine with clear bios or bios mod but nothink special

Any help?

IMGUR: https://imgur.com/a/yDM9P

[MATHReX]

Did you bios mod according to the memory vendor of the GPU?
Did you installed blockchain drivers which fixed DAG hashrate issue?
Did you memory overclock the cards?
Are you running latest instance of Claymore miner?

[xxcsu]

get the blockchain driver form here : Radeon Software Crimson ReLive Edition Beta for Blockchain Compute Aug 23

also make sure you set the Virtual Memory size in Windows at least 16 GB

[tg88]

In 17.12.1 version you need to enable config in Global Settings -> GPU Workload of AMD Radeon Settings.