It seems the ASROCK H81 Pro BTC motherboard is no longer being sold (no more sellers in UK although several a few weeks ago)- can anyone recommend a good alternative? It would need to have 6 PCEI slots.
UPDATE: I mean the “Pro BTC R2.0” version.
ASROCK H81 Pro BTC R2.0 ?? 
MSI Z97 Gaming 5 Up to 7 GPU
BIOSTAR TB85 LGA 1150 Intel B85 SATA 6Gb/s USB 3.0 ATX Motherboards - Intel
I agree on the Biostar TB85. I’ve had to mess with the BIOS too much on the MSI Z97 Gaming 5.
The Biostar just works. And it costs less.
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try MSI mother cards they are ok for me
On Gaming 5 you just have to change on Gen 2 and 96 Latency.
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OK, just made that change on my 7 MSI mining rigs. Wow, what a difference! I thoughts I had bad risers, but all I needed to do was make a BIOS change.
No more daily rebooting due to a card dropping off.
Thanks!
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Bought Asrock fm2a88x+ btc from ebay, really cheap and fast shipping from Germany.
Currently running 4 cards there now, think it’s max 5 GPU.
Happy mining ! 
I have 3 rigs on Gaming 5 running without any issue.
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What about MSI Z97 Gaming45, I can’t start with 7 cards?