12-bit 4:4:4 requires double the bandwidth of 10-bit 4:2:2. So a single 4Kp60 signal at 10-bit 4:2:2 requires 12Gbps, but at 12-bit 4:4:4, 24Gbps is required (which would mean two 12G SDI cables).
Similarly 120fps requires double the bandwidth of 60fps, so a 4Kp120 signal at 10-bit 4:2:2 would require 24Gbps. Going up to 12-bit 4:4:4 would double things again, so 4Kp120 @ 12-bit 4:2:2 would require 48Gbps or four 12G SDI cables.
If you look at page 9 of this PDF, there is a chart with some common video standards and the bandwidth required for each:
https://www.smpte.org/sites/default/fil ... 3-Full.pdf