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Asrock H81 Pro Btc failes to recognize GPUs in x1 PCIe slots

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Hello everyone !

As the title says I have some problems with my GPUs getting recognized by my mining rig I am building.

In the past I built some rigs using old computers, but they were 1-2 GPUs max. I decided to build a 6xGPU rig and bought these parts:

XFX R9 380x x6
Asrock H81 Pro Btc
Intel Celeron 1820
4GB DDR3 RAM
PSU 750W x2
USB 3.0 PCIe x1-x16 Powered Risers x6

I am using Ubuntu 14.04. and I have set everything up following this tutorial.

My GPU gets recognized only when I plug it in directly into x16 GPU slot, if I put any or all of the cards into PCIx1 slots, none will get recognized, and Ubuntu will default to the onboard graphics.

I ordered my powered risers here, and here.

Does anybody have any idea how should I debug this?

Regards,
Milken

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