According to the AMT Reference Guide, the AMT 9.0 supports up to 2K resolution
https://software.intel.com/sites/manageability/AMT_Implementation_and_Reference_Guide/default.htm?turl=WordDocuments%2Fkvmandintelamt.htm
Does the AMT 10 or AMT 11 support 4K resolution?
Thank you.
According to the Intel support's answer, the maximum supported resolution of the AMT10 and AMT11 is 2K.
https://software.intel.com/en-us/forums/intel-business-client-software-development/topic/600179#comment-1848093