Not getting the hash rate I was expecting from RX 480

Hi All,

I'm a newbie, just setting up my first rig. I bought 3 RX 480s, and I was hoping for 25 MH/s for each one (which seems to be reasonable).

For now I'm just running one of the GPUs.

I seem to be getting only 20.5 - 20.8. I'm using ethOS, and I'm assuming the 'Hash: ##.##' is my MH/s.

I've played a little bit with overclocking, but haven't seen much difference.

The cards I bought are XFX RX-480P4JF. Reported in ethOS as 'Ellesmere RX 480 113-48045HYD1-W81 SK Hynix'

They have 4GB of RAM. Core clock is 1266MHz mem clock is 7000MHz.

What am I doing wrong?

Thanks,

MinerTim