Hello HP z24i is tested and there is no PWM,but there is no HDMI and usb ports are 2.0.
So HP z24n display is narrow bezel and have HDMI and usb are 3.0.(there are no other difference between them except
z24i = AH IPS / LED backlight z24n = AH IPS/WLED backlight.
Whish is best for eye strain LED or WLED.One of them is more brighter i think?
From HP I think they said that all monitor from series Z is flicker free,but I don`t believe them.
I am waiting for your opinion.
Thanks
