Multiple 1080 and 4k camera on jetson tx2

Hi all, According to the specifications of the jetson tx2, it supports 3 4k cameras and 8 1080p 30 cameras, since 4k is 4 times 1080p will it be that if I put 4 cameras 1080p 30 and a 4k can work ???

and is there a configuration that connects 6 4k cameras?

is that i saw a product that claims to have 6 4k cameras running on nvidia tx2 with 45mp resolution and when i stopped to think, 45 ÷ 6 equals 7.5 and 7.5 does not make 4k video