Are you sure? Pretty much all HDMI cables of good quality sold today are HDMI high speed cables. You might want to double check on that.
Since you do have a 4K monitor, 6x IR is native 4K quality, but the difference between 4x and 6x is hard to tell, and is up to personal preference from what I've been able to see on my 4k tv
Since you do have a 4K monitor, 6x IR is native 4K quality, but the difference between 4x and 6x is hard to tell, and is up to personal preference from what I've been able to see on my 4k tv

