I have a 1080 Ti FTW. I was having problems with screen flickering on my PG258Q and RMA'd it. The problem was occasional flickering lines that were vertical. I narrowed it down to the monitor by trying to record the problem with screen capturing software, where the problem did not show. However, I could capture it with my phone. Asus sent me a new monitor and the problem was fixed. Now, the new monitor had developed a flicker that was not the same. The flicker was a white or black flicker that would appear over half the screen or so. I never noticed it during games. I once again blamed the monitor. Well, I just bought a new monitor and sure enough I just got the same flicker. I'm beginning to think that the 1080 Ti is the problem. The problem is really difficult to capture, as it is random and does not happen very often at all. I can go days without seeing it.
 
The image that I captured shows it at the bottom of the screen. It is a very faint white flicker that extends even into the task bar, so it is not the video or the browser. I captured it on a video, because it seems like it is easier to recreate while watching a video. However, I have noticed it other times as well. I wouldn't say that it doesn't happen while playing games, but I have not noticed it during games.
 
 

Sajin
Does the issue occur on displayport & hdmi?

I really never tried that, as the first monitor I had ran at 60Hz on HDMI. Pretty much worthless. Maybe I'll try it on this one now, as it runs at 240Hz through HDMI. Are you thinking a bad port or something else?

Sajin
Bad port, or bad cable could be the issue.

Tried multiple cables. Tried all of the DP ports as well.

Sajin
Try hdmi now.

I'm really starting to wonder if it is a Windows or driver issue. Maybe, even a program issue. Pretty much this has to be either a program/Windows, or the card. Flickering can be really hard to pin down, as there are so many variables involved. Are there any other parts of the card that could cause this? Power cables? Power connections? PCIe ports? VRAM?
 
EDIT: I have an ASUS ROG z390-i motherboard in a CORSAIR CRYSTAL 280X RGB Micro-ATX Case. I have to put some pressure on the PCIe cables to get the side shut. Not a lot of pressure, but it does bend those cables a bit at the card side of the connection and seems to move the card back a bit to get the side closed.

I have my DP cable running directly in-line with my PC's power cable. They are essentially bundled together with other wires, so those two are pushed together tightly. Is it possible that there is interference? I didn't think that interference could really happen with digital cables, but maybe? Of course, analog cables are subject to interference, but a DP cable?

Sajin
No I don't think that is the issue.

Yeah, it was more of a shot in the dark. I don't think it is the issue either, as I've always set my desk up this way without issues and it is a digital signal.

I didn't realize the card actually has three DP ports. I am trying the third right now. However, this is a slow troubleshooting process, as the issue can sometimes take days to show up. So far today, I've had no issues. Honestly, if it is a port I'm just going to have to use the other ports as the warranty period has passed.

What kind of cables did you try on the displayports? If they aren't vesa certified cables then that could be your problem.

Well if the hdmi port doesn't give any issues then something is clearly going on with the displayports.

If those ports really are bad, it really is a shame, as I am literally days outside of the warranty. 5/26/2017 was the day that I bought this card.

Sajin
They probably all connect to a hub on the card that splits them all up. I could be wrong about that though. Guess you're not seeing the issue over hdmi?

Not yet. Sad though, over the past 6 or 7 months I was blaming Asus for giving me another faulty monitor... If I would have know that it was the video card, I would have a replacement. Now that warranty period passed though... LOL. SOL.

Since it seems like the DP on the card is the likely problem. I guess, I will have to wait for the 3000 series to come out in a couple of months and do like I did last time and buy an Asus card. My Asus 2080 Ti has given me zero issues and the QC was solid (no loud coil whine). I am going to have to use HDMI and wait for the 3000 series as there would be no point in buying anything now with the 3000 series around the corner. Essentially, this computer gets my old 2080 Ti and my main computer will get a 3080 Ti when it comes out. Someone else gets a 1080 Ti with a faulty DP connection...
 
EDIT: I wonder if EVGA can fix the DP for a small fee?

chrisdglong
Hey Sajin, do you think this is something that could be fixed by opening up the card? It's a wild shot, but I am willing to take a look at it if I have to.

No, I don't, but you could check it out anyways. Since you're out of warranty you could try baking the card in the oven to see if that might fix it.

Very possible. Guess you'll find out soon enough.