To add on, even pcie 3.0 x4 has plenty of bandwidth for a gtx 1080. https://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_1080_PCI_Express_Scaling/25.html htt

To add on, even pcie 3.0 x4 has plenty of bandwidth for a gtx 1080. https://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_1080_PCI_Express_Scaling/25.html https://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_1080_... This is the same reason why nvidia didn't bother with HBM for the 10 series. Those gpu's do not need that much memory bandwidth and in most cases GDDR5 provides plenty of bandwidth as it is.