VideoCardz.com on Twitter: "GeForce RTX 2070 has a different board than RTX 2080. It does not have NVLINK. It may also be using different GPU -- TU106. I think you should know
Nvidia won't be supporting NVLink SLI on the GeForce RTX 2070 | KitGuru
NVIDIA's GeForce RTX 2070 GPU Will Not Support NVLink SLI, But Why? | HotHardware
Nvidia won't be supporting NVLink SLI on the GeForce RTX 2070 | KitGuru