I have a flashed Maxwell card that displays a boot screen on my 4K display. While the resolution that I use in macOS is 1920 x 1080 (retina mode), the resolution of the boot screen seems fixed to the display's native, yet uncomfortable resolution of 3840 x 2160. I would like to have a boot screen at 1920 x 1080. Since I had not read anything about such a limitation before getting the card, I thought that I would mention it here. I would also like to ask: is there anybody with a 4K-boot-screen-capable card that enjoys a comfortable boot screen resolution? I have tried two things to change the resolution, but remain unsuccessful. My first strategy was to boot into the OS without the web driver (relying only on the EFI), and in the display preference pane, change the resolution to the desired one. Unfortunately, the setting doesn't carry over to the boot screen. My second approach was to add the NVRAM boot argument "Graphics Mode=1920x1080x32". Again, this did nothing.