If you're doing it to get downsampling, it's best to let Dolphin handle it. Set the fullscreen res to 1080, and then set the IR to 6x by setting EFBScale to 9 in Dolphin's OpenGL and D3D ini files.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
