Yes ,  that all 7 Riser is work .
Do you have plug power cable into USB Riser

I have two power type slot USB Riser,it must plugged power cable~
http://imgur.com/a/eIXIh

Hello,

My bitcointalk Activity is to low to past image.
So, I past all step by step with image on my website.

It's easily to setting BIOS !

Secret is BIOS Above 4G Decoding to Enable.

Z170 Z170A  BIOS setting  Run 7 GPU mining Success on Win 10  Step by step​
http://mining-hardware.weebly.com/blog/z170-z170a-bios-setting-7-gpu-success-on-win-10-step-by-step




My Other past .
It's my mining collect knowledge to share everyone.
Thank's everyone.

How to distinguish GPU quality to tuning your GPU
http://mining-hardware.weebly.com/blog/category/tuning-gpu


MSI GAMING X RX 470 4GB BIOS MOD Hynix chip ​28 Mh Step by step​
http://mining-hardware.weebly.com/blog/msi-gaming-x-rx-470-4gb-bios-mod-eth-28mhs-hynix-chip-overclocking



MSI GAMING X RX 470 8GB BIOS MOD Micron chip ​28 Mh Step by step​
http://mining-hardware.weebly.com/blog/msi-gaming-x-rx-470-8gb-bios-mod-28mhs



OLD BIOS Z170 Z170A BIOS MOD 6 GPU Success mining step by step
Secret is  BIOS  modify
All PCI-E to Gen 1 and  MAX TOLUD set to 3GB 
http://mining-hardware.weebly.com/blog/category/z170-bios-mod


Hope it helps you.