Why sometimes one cabinet has 2 receiving cards

Why sometimes one cabinet has 2 receiving cards?

Why sometimes one cabinet has 2 receiving cards? Use the following products as examples: Hardware: Module Outdoor pitch 3mm, module size 192*192mm, driver IC: ICN2038s Cabinet Size 960*960mm, cabinet resolution 320*320pixel Receiving card MRV366, 2pcs each cabinet. Control area: Internal signal wiring diagram of the cabinet: Explanation for MRV366: Maximum pixel control capacity for MRV366…