Normal
https://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_1080_PCI_Express_Scaling/24.html the higher the res the lower the loss. It's 92% minimum nonetheless, if it's via CPU direct then 96% minimum for the 1080 at least.The 2080 Ti suffers https://www.techpowerup.com/reviews/NVIDIA/GeForce_RTX_2080_Ti_PCI-Express_Scaling/6.html more but still 91-94%.
https://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_1080_PCI_Express_Scaling/24.html the higher the res the lower the loss. It's 92% minimum nonetheless, if it's via CPU direct then 96% minimum for the 1080 at least.
The 2080 Ti suffers https://www.techpowerup.com/reviews/NVIDIA/GeForce_RTX_2080_Ti_PCI-Express_Scaling/6.html more but still 91-94%.