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post #5001 of 6126
Quote:
Originally Posted by athenaesword View Post

there have been people who haven't noticed it on their panels tho

In that case who knows! The question is - is it because it is always a problem and they haven't noticed, or because a few of us have got unlucky? weirdsmiley.gif
post #5002 of 6126
That sucks. For my part I'm waiting until we learn more before I do anything besides a cable swap. I'll try the new DP cable when I get it on Friday but if it doesn't help I can't imagine I'll immediately want to return it. There is just too much unknown about the problem so far and no comment from Acer or Nvidia yet. At least I wouldn't want to exchange it until NewEgg has them consistently in stock, no sense sending mine back only to wait weeks for a new one. If I have to wait for weeks I'd rather send mine to Acer or Nvidia so they can poke at it if they can't replicate the issue internally.
post #5003 of 6126
Quote:
Originally Posted by FasterThanLight View Post

In that case who knows! The question is - is it because it is always a problem and they haven't noticed, or because a few of us have got unlucky? weirdsmiley.gif

On mine sometimes it is really obvious and sometimes it's not. If you had one on the side of the spectrum where at it's worst it looked like mine at it's best then I think it would be entirely possible to be completely oblivious to it. The only way to know for sure is to have someone who has seen it get a new one where they don't see it anymore - and that still doesn't tell you about the percentage it impacts.
post #5004 of 6126
Thread Starter 
I run my X34 100% at 100 Hz G-Sync and don't see any horizontal lines. I remember on my old 2B Catleap when overclocked they were pretty apparent. Anyone have a good image to test with? If I remember correctly, grey was the worst.
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Zybane
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post #5005 of 6126
Quote:
Originally Posted by drfish View Post

Well that cable is listed in the displayport.org certified products database AND the link from there to the MFG page for it shows that it is triple shielded. thumb.gif

So, if a better cable is going to help, this is about as good as it gets. I'm not optimistic though.

I just wanted to try something before doing a return. One nice thing if I have to do a return, buying the monitor got me a free 6 months of NewEgg Premier so I should have free shipping on my return.

Oh this is nice. I was not aware of a database nor thought to look up datasheets for these cables. Thanks.

Quote:
Originally Posted by FasterThanLight View Post

Seems like it - it's beginning to look like it is a problem affecting all of them, as Mountainlifter has said, this was a problem with the TN ROG Swift too and seems related to the G-Sync module, although it is odd it gets worse at lower FPS. It's very frustrating tbh - a perfect monitor tarnished by this one thing! But if I can't use G-Sync because it degrades image quality then I may as well use my Dell!

To be clear, the problem with the first ROG swift was the appearance of alternating correct and dark lines of pixels along the vertical which was an order of magnitude worse than the "horizontal scanlines issue" with the X34 (speaking based on the pictures shared on this thread). Ofcourse, that does not make the X34's problem acceptable in any way.

Moreover, the guys at PCPER pegged the ROG SWIFT problem (which also manifested in other TN G-sync panels) as one of a few "TCON or Timing controller related artifacts". They also have stated that this TCON problem should only affect TN panels. I'm not sure what the reasoning behind that is but they said that the issue is independent of the G-sync module. This makes sense because the swift's issue was independent of whether G-sync was On or Off.

Source: http://www.pcper.com/reviews/Displays/Acer-XB270HU-27-1440P-144Hz-IPS-G-Sync-Monitor-Review/G-Sync-Errata-and-TCON-Artifa

If what they say is true (Swift's issues were TCON/TN related only and not related to G-sync), then the cause of the "horizontal scanlines issue" with the X34 cannot be the same. So far, everything points to the G-sync module being the cause for the X34's issues since turning on G-sync causes it.

EDIT: In summary,
ROG swift vertical lines --- caused by TCON+TN only. (unrelated to G-sync module)
X34 horizontal lines --- probably caused by G-sync module. (not verified.) (unrelated to TCON)
Edited by Mountainlifter - 11/4/15 at 9:40am
post #5006 of 6126
Quote:
Originally Posted by CallsignVega View Post

I run my X34 100% at 100 Hz G-Sync and don't see any horizontal lines. I remember on my old 2B Catleap when overclocked they were pretty apparent. Anyone have a good image to test with? If I remember correctly, grey was the worst.

The folks here are using the G-sync pendulum demo. Switching G-sync On and Off switches the scanlines On and off respectively, in real-time.

Just a grey image won't help to test the issue unless G-sync can be enabled on the desktop.

So, it's either the G-sync pendulum demo or a game with bright colors with an open sky like Far Cry.

EDIT: SO far no one who says they do not have the issue has posted pics. If you could do that, it would be an assurance to those that have the issue that they could potentially get it replaced with a working unit later on via RMA
Edited by Mountainlifter - 11/4/15 at 9:10am
post #5007 of 6126
I play far cry 4 with g-sync on and do not see any strange lines.

However, I have to do the work around where I launch the game with g-sync set to work in "full screen and windowed mode" in the nvidia control panel (otherwise the game BSODs with a driver_stack_overrun error) and then once in game I alt tab back to the desktop and change g-sync to run in full screen only mode (seems to improve framerate) then alt tab back into the game.
post #5008 of 6126
Quote:
Originally Posted by drfish View Post

So I'm thinking about buying a new DP cable to try and address the horizontal lines problem. I'm also thinking about getting some kind of line filter for the AC adapter. Do you think I should even bother or just return it for a replacement? Or just wait a bit longer before I do anything? So far no work from Acer about the issue, they seem preoccupied with the back-light problem...

I bought a new cable to see if it helps, but sadly there was no difference at all.
post #5009 of 6126
good evening everyone

I've made some tests...again biggrin.gif

tried Witcher 3 (about 35 FPS) and NO SCAN LINES
tried Batman AA GOTY (about 55 FPS) and NO SCAN LINES
tried Tomb Raider Underworld (95 FPS) and NO SCAN LINES

pls note that my set up is 2x GTX670 SLI so 95hz is my max refresh rate

Drivers 353.62

the latest drivers (358.59+hotfix) cause my FPS to drop to 8 on ALL games
Edited by BethorMorgan - 11/4/15 at 10:11am
post #5010 of 6126
So for those who has this issue have you tried 95hz?
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