How important is the quality of the HDMI conductor?

Question

HDMI

Good afternoon,
There is a computer with two HDMI outputs, two monitors are connected, the picture quality hurts the eyes, the text is difficult to read.
If you connect the monitor with a DVI cable via an HDMI-DVI adapter, there is no such problem.
Therefore, I came to the conclusion that the cable is not the best, can it be so, or have I missed something?
UPD:
Monitor model: HP Pavilion 22xi, 21.5"
Video card: Sapphire RADEON R7 240 LP with Boost (RTL) DualHDMI
Text when connected via HDMI:
postimg.org/image/8of9l0mur
Text when connected via DVI:
postimg.org/image/5ah0wcj1f

Answer 1

hdmi is a digital standard, it cannot add interference, if there is no picture problem with the cable at all, or it will be strewed with "squares", the quality should not be affected

Answer 2

In fact, HDMI is a digital interface and the picture does not depend on the quality of the cable.
Connect any of the 2 monitors? Any of the 2 hdmi cables?

Are there two monitors connected
or am I missing something?

You missed your monitor models.