Multiple units of G900 processor can build UHD MultiViewer. One G904 can create two Triple windows outputs. After feed these two outputs into one G901 with POP setting, user will see 6 windows MultiViewer.
One G904 can create 4 split windows in one output. 4 units of G904 will create 16 split windows in 4 outputs. The last G904 can combine the image from these 4 outputs into one 16 windows MultiViewer for one UHD display.
G901 G902 G904