Trouble with Z170 Extreme3

[Pepperok]

Hi, i have a trouble with my motherboard


my Operating System Windows 10 x64

All drivers are official

but when i plug 6 videaocard i have the next mistake



This device cannot find enough free resources that it can use. (Code 12)
If you want to use this device, you will need to disable one of the other devices on this system.




3 videocard work properly, and the other not work.


How can i solve with problem

 

[popatim]

that mothrbd only has slots for 3 video cards

 

[Pepperok]

thank you for answer, but there are 6 PCIe slots

3 PCIe 3.0 x16, 3 PCIe 3.0 x1