GPU Riser cable i used on my Core P3 , got errors / Blue screen , losing signal on Monitor , PC would restart , I looked the error up using "BlueScreenView"
Bug check code: 0x00000116 , Crash address: ntoskrnl.exe+70180 , Took the riser cable out & use my GTX 1070 in normal position ,All is fine again.
Core P3 a super best Open air case & Looks Lovely on shelf above monitor with LED's behind the P3 & so easy to change hardware ,
The Riser cable I don't recommend using , especially on a Full size ATX as blocks all other ports on motherboard for future ad on cards ,
If you want to see the face of the GPU fans or Water block , best to have the P3 mounted on a wall or a adjustable Rail shelf & then you can look up & see the Face of the GPU Fans or water block. see if i can post a photo later on of my P3 on the rail shelf