I decided to build a new rig, and was struck by a compulsive buying disorder : instead of going for a standard asrock BTC PRO, i bought a skylake Asus H170 Pro Gaming Mobo along with a Intel Core i3 6100, 6 GPUs and a PSU big enough to power everything
My problem is the following : no matter what Os i use (tried Win10 / xubuntu 15.10 / xubuntu 14.04), my mobo is unable to detect all my GPUs. At best i got 4 GPUs working on each OS.
This error showed up in the device and hardware monitor : This device cannot find enough free resources that it can use. If you want to use this device, you will need to disable one of the other devices on this system. (Code 12)
I've also tried to change the Mobo's BIOS, without any noticeable changes. I checked my risers one by one, no problem on this side.