Low hash rate on 2nd and 3rd GPU

Mining
1

Hi,

I’m running ethos distro with the Claymore miner on a Asus “P8H61-M Evo” board with three RX480 GPUs. All GPUs are connected with riser boards.

While I’m getting hash rate of 275 H/s on the first GPU, the other two GPUs are on 63 H/s. I’ve upgraded BIOS of the motherboard to the latest version, but I’m kinda stuck now. What could be the reason for the low hash rate?

2

Try rotate the GPU. If 1st perform bad in 2nd slot, maybe the riser or the sysboard has a fault.

My gpu 1 needs sometime a bit to get the full sol rate, sometimes up to 2 hours.

You could try a benchmark or a other pool to verify the sol problem.
Maybe a other mining software? Newer/older/different one

3

I would suspect the MB itself. but as zPools suggested, rotate GPUs. If first slot always gets higher rate than slots 2 and 3, (and raisers are good) , then its the MOBO.

4

Thanks a lot for the help. I’ve replaced the board and now I have the same hash rate on all GPUs.