I am a reseller of Biostar products in Europe.
For those that can't see more than 4 or sometimes even less, from my experience, if you have risers with SATA power, make sure that you use only two per cable. If you are out of SATAs' use molex adapter to SATA power.
I could see all the 6 GPUs on a TB250 mobo but had unstable performance, so I did what I mentioned above and it worked perfectly. All i did in BIOS is turned the mining mode on and nothing else. This rig was with 6 x 1060s'.
Should you need any help, feel free to contact me and I help from what I've learned so far
