Strange problem - 4K HDMI


Prominent Member
Got a bit of an odd problem with my card, an EVGA GTX1070 FTW. I have recently got myself a 4K TV in the room with my PC, so for the odd game I want to play with controller from the sofa I decided to run a short HDMI to the TV, simple.

The TV is a 4K HRD ready TV, so thought I would switch on all the bells and whistles with my PC. I set the PC to only display on the TV and turned on HDR and set the res to 4K.

Then while playing on the TV the signal goes black for a second or two, then comes back for a few min, then goes again, then comes back for some amount of time (anything from 1-15min) then black, then back, then black etc.

I figured maybe its the HDMI cable, not up to snuff. So cut the resolution in half and turned off HDR. Still had the same problem.

For tits and pickles, I decided to use a displayport to HDMI adaptor and try one of the display port connections on my card rather than the HDMI. That was about 2-3 days ago and I havent had a signal drop out since, for some reason on Hitman I still cant get HDR working but I am playing away happily at 4K 60Hz using a display port to HDMI adaptor and the same HDMI cable as before.

Any ideas? A bad HDMI port on the card?


Distinguished Member
PCs can be set to parameters that exceed the HDMI 2.0 standard as monitors can exceed that spec via displayport.

So check your graphics settings.

4K 60 4:4:4 HDR

Exceed 18gbps and you get issues over HDMI but not displayport.

Displayport to HDMI will convert the output so thats probably why there are no issues going that way.


Prominent Member
What settings? I had it set to 60Hz 4K resolution and enabled HDR - no bueno, then I changed to 2K 60Hz and disabled HDR - Still no bueno.

TV I am using is a 7 series Samsung QLED


Distinguished Member
What settings? I had it set to 60Hz 4K resolution and enabled HDR - no bueno, then I changed to 2K 60Hz and disabled HDR - Still no bueno.

TV I am using is a 7 series Samsung QLED

Graphics card settings.
Specifically relating to deep color , bit depth , and chroma sampling,
So 8 , 10 , or 12bit and 4.2.0 , 4.2.2, or 4.4.4. ....that type of thing.
See attached screenshot of the menu....


First step is to set to 1080p at 60fps , 8 bit, 4.2.0 , no should handle that fine.....then step up from there to find the limit.

The link I posted above lays out the combos that should work for UHD with HDR to a TV.
It also lays out the combos that wont work.
If you have all the “bells and whistles” turned on in your GFX settings it definitely wont work, not over HDMI to a TV anyway.
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Distinguished Member
This might be related to the issue I've had on and off and came to the conclusion it was down to the Nvidia drivers: Question - Issues with NVidia drivers

I'm currently running with one from the end of last year and no issues on either of my screens.
What can fix it sometimes is running a game in a boarderless window, I ended up using a freebie app to switch it on and off, something like this:
Windowed Borderless Gaming

Furnace Inferno

Prominent Member
It should auto-detect the capabilities of the display anyway and not let you switch to something it can’t handle, mine does anyway. If it’s blacking out there’s definitely a bandwidth issue somewhere.

As for Hitman HDR, it’s fudgeed plan and simple, it simply doesn’t work after one of the updates. All I could get was a black screen as soon as HDR was activated anywhere so don’t waste your time with that one.

Forza 7/Horizon 4, FFXV, ME:Andromeda, AC:Origins of what I’ve tried all work perfectly fine though but most need you to activate HDR in display settings to work in-game rather than letting you toggle which isn’t ideal.

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