I’m not sure you get audio from HDMI audio on Haiku with any recent cards if any at all and especially not Nvidia cards as they lack documentation? Radeon HD works with GCN cards older than polaris so like a 280X probably works etc… Radeon Output ports I believe there is some work to get displayport working by YMMV.
If you want to boot Haiku on a Higher end machine you really need one that is several years old, Intel or Radeon graphics that is several years old etc… even then the different more complex pcie bus architecture of higher end machines may not play nice.