HP ZR2740w via HDMI.. right resolution but RGB speckles


i've had no issues getting perfect picture apple usb-c hdmi av adapter connected dell 2515h monitor @ 2560x1440, have tried same hp zr2740w monitor, hdmi lead connected dvi , picture covered in red, green, , blue speckles though resolution achieved.

picture usable imperfect, , doesn't change in quality @ lower screen resolutions.

have tried other hdmi dvi cables (including quality dvi-d cable), , result same. tried hdmi displayport cable, no signal received monitor , resulted in black screen. have tried different refresh rates through quickresx still no difference.

latest 10.10.4 version of os x claimed fix monitor issues, has't changed thing.

looks i'll have wait until proper usb-c displayport adapter (i.e. 1 allows charging) arrives, or there other solutions worth trying?
 

attached files:

same issue me. i've tried 2 hdmi/dp adapters. resolution/refresh rate fine, except rgb sparkles same if dvi cable broken.

panel hp zr30w.
 


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