hi, I have a problem with the H81 Pro BTC R2.0 board
the last card is not visible
after disconnecting the 5 card, the problem skips to card number 4http://forum.hiveos.farm/uploads/editor/9t/q04cs2d5zskh.png
each time it is the last card
I’ve uploaded bios 1.30 to the motherboard
Above 4g - Enabled
I do not know the problem anymore
the best thing is that when I add 6 cards, I see 5 cards 
weird… just shooting in the dark, do you have enough power to your motherboard? Seems Asrock has a molex or two in the motherboard itself.
- Try changing the riser cards.
- Are all 3 Power connectors connected to the Motherboard?
- As f3rry said do you have enough Power?
- Sure? Did you measure it at the wall (f.e. with Kill a Watt)
The H81 Pro BTC R2.0 sometimes does not wait long enough to inizitialize all cards.
Change from GEN1 to Gen2 or backwards in the Bios. Any changes?
You can also do a dirty trick and go in the Bios save with “no changes” and let it boot. For me this always does the trick. Seems that the time for intialize the cards is longer this way.