More than ONE Graphic Card on ASRock P67 Pro3

[biro]

hello

i tried to install a second and later third graphic card on this motherboard.. i know that it has only ONE right slot..

first card = GTX 980
second = GTX 980

i have PCI-E 1x - 16x flexlibler Riser

OS = Window 10 Pro

I have a second Powersupply.. the Ventilators of the 2. Card is running.. but i don't see it in the windows configuration..
do i have to change something in the bios

there are so many parameters which can be the problem.. therefore i prefer to ask..
would be great if somebody can help me..

thank you
greetings
roger

[VRobb]

Yet again, This: https://bitcointalk.org/index.php?topic=2017600.0