Question RTX 2070 two monitors resolution and Hz issues

[blekota2k]

Hello, this issue of mine started suddenly. One day was everything ok, another day big issues. Picture started to be messy, wierd symbols, colors etc. I got another graphic card and picture is ok, but i cant setup proper resolution and frequency.

I have dual monitor setup with extended desktop, one is some iiyama with native resolution 1920x1080@60Hz connected via HDMI, second one and my primary monitor is BenQ XL2720 1920x1080@144Hz connected via DP (1.3/1.4 cable, new, just bought it today).

When i have bot monitors connected, i cant set the BenQ to 1080p resolution with 144Hz, each reboot changes the option i got, one time its just some 1280x720 and 60Hz, another reboot and i can choose 1080 but only 100Hz and color output can be only YCbCr422 and limited dynamic range.

If i disconnect the second HDMI monitor, i can select full hd and 144Hz.

My gues is that my motherboard could be dying (if not whole card, PCIe slot at least) but i dont how to test it.
Another gues could be power supply.

Any gueses?

EDIT:
My spec:
CPU intel i5-8400
16G DDR4 RAM
M.2 SSD + HDD
Win 10 Pro
MB ASRock Z370M Pro4
PowerSuply 900W

 

[knickle]

Do a google search for> nvidia space invaders < and look at the images.

Are those screen shots the same as what you are seeing?

 

[blekota2k]

yes, that was the case for the first graphic card, this new one does not do this, just the resolution and frequency issue

 

[knickle]

ok, I'm confused. What was your old GPU, and what is your new GPU? Are they exactly the same?

You should also list more info about your computer, such as: the operating system, CPU, motherboard, power supply, etc..

The more details you provide, the better people will be able to suggest possible solutions.

 

[blekota2k]

I edited the main post with my spec, thx for pointing it out

As to your question: i had Gigabyte RTX 2070 WINDFORCE 8G card and when the "space invaders" appeared i took it back to seller and got new one, MSI RTX 2070 ARMOR 8G OC.
So far (second day playing) no space invaders but the issue with resolution and frequency.

 

[blekota2k]

UPDATE: yesterday after whole day when i was about to turn my pc off i checked the nvidia control panel resolution setting and found out that the full HD@144Hz option is avaliable, so i selected it and it all worked. Today i turn on PC and main display was in 720p resolution and only way how i can make dual full hd resolutions is if both displays r at 60Hz.
Im wondering if after another few hours the full hd@144Hz option will show up again ...