I meet a question.  I use 4 VE8950R to connect 4 monitors, which just support 1080p resolution, to make a 2x2 video wall.

When I play a 4K video on Youtube and post it to whole screen, the video see like 1080p video, not 4K video.

The source supports 4K resolution.  If I directly connect the PC to a 4K monitor, it could display 4K resolution.

How can I use 4 1080p monitor to display 4K resolution video on this 2x2 video wall?

Which EDID mode should I use on VE8950T?  I try auto/manual/remix, but get the same result.

The VE8950R would do the EDID communication with the 1080p monitor and detect it's a 1080p monitor.

So after pass the EDID information through transmitter to the PC, PC will display 1080p resolution video.

For video wall, in your testing condition, PC will transmit 1080p video, no matter which EDID mode you choose.