In January 2022, consumer-grade graphics cards support only four monitors each in the higher tiers. What is the technical limitation that dictates only four?
DisplayPort 1.4a MST can support 32.4 Gbit/s and in MST mode this will support up to four monitors 1080p@60 Hz.
The 11G-P4-6696-KR graphics card has three DisplayPort ports. What technical limitation prevents the vendor from allowing all three ports to support x4 1080p@60 Hz?
With 11 GiB of graphics memory I would expect that many frame buffers could be supported for simple things like web browsing and other office type applications.
1080p ARGB 8 bit depth (32 bits), color buffer only, is slightly under 8 MiB.
11 GiB / 8 MiB = 1408 frame buffers for basic desktop tasks. For the uninitiated, this is a gross simplification if the desktop composition environment which will have many rectangular surfaces that have textures applied to them, but this is a lightweight computation for this class of graphics device.
So with that in mind, the limiting factor must be something else in the graphics hardware, possibly the bandwidth of the ROPs. Another possible bandwidth limitation would be the encoder that has to transform the in-memory frame buffer representation into a format understood by the target monitor.