RX 5700XT install help!

[AlienwareGPU7000]

I have an alienware tower 1kW supply, just got my RX 5700XT card and I am unsure of the power supply to use. The output from my PSU are 2x 6pin CPU cables, but the card has an 8pin and 6pin inputs. Tried connecting just to the 8pin with an adapter, and then to both and didn’t work, my monitors were flashing “check signal cable”. Please help. (FYI: either way I connect it both fans do spin)
Attaching 2 pictures.
Thank you for your help in advance!

 

[StarryByte]

I think you should be fine sticking both of them into gpu that one 8 pin adapter and the other 6 pin, your psu should be fine. And check if you connected monitors to your gpu, i forget that sometimes, idk how about you. And that is not CPU 6 pin cables their are pcie if i remember correctly, you cannot stick them to pcie gpu slots. If you want to read more about your situation: https://pcpartsgeek.com/can-you-use-6-pin-into-an-8-pin-gpu/
*I am not expert about any topic and it is only sugestion.

 

[DirtyDingusMcgee]

Part number of power supply? Give us something to work with.