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ACER Predator X34 Owners Club - Page 37

post #361 of 3075
I remember getting scan-lines on the first overclockable 1440p IPS monitor the Overlord Tempest (same thing as the Korean Catleap monitors). The lines became more prominent the more it over overclocked past 60hz. My complaints were quickly squashed by all the "elite" FPS fanboys who didn't care about anything except faster FPS. I know people have linked this to the G-sync module but it's quite a coincidence the same thing is happening with yet another "overclockable (results may vary)" monitor.
Edited by Seyumi - 11/13/15 at 8:23pm
post #362 of 3075
Quote:
Originally Posted by Scoobydooby11 View Post

That's what Mikey asked me to test which I will later. I feel like I'm one of the few who hasn't witness scanlines at all.. I've tested in numerous games, benchmarks and pendulum

Going on my second week now with my X34, and i'm still in the same boat as you and my previous screenshots - ZERO scan lines at ANY fps, at ANY OC, G-Sync On or Off, etc...you name it, i've tried it. I've looked for scan lines in the Pendulum demo, but nope...still crystal clear like the pics I posted. Looked for them in Fallout 4, Crysis 3, SC2 LOTV, D3...and a ton of other games. Nothing I test can produce scan lines at all.

Sucks to hear having people having them but I stand by my own personal experience that there are definitely 'flawless' X34s out there, regardless of how seemingly 'rare' they are amongst the low supply from Acer. If I were in anyone's shoes who has scan lines I definitely would have sent my monitor back for a refund already.
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2x EK-FC Titan X Pascal Nickel GPU Blocks w/ EK... 2x EK-RAM Monarch X4 Nickel/Acetal CSQ RAM Bloc... Windows 10 Pro, 64-bit 1x Acer Predator X34 @ 3440x1440p 34" IPS + 100... 
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Apotheosis
(27 items)
 
  
CPUMotherboardGraphicsRAM
i7 5960X @ 4.6 Ghz (1.32v) ASUS X99-Deluxe 2x Nvidia Titan Xp SLI 32GB Crucial DDR4 2666 (4x8GB) 
Hard DriveHard DriveCoolingCooling
2x Samsung 850 Pro 256GB SSD (OS) 4x Crucial M4 256GB SSD 14x Corsair SP120 Quiet Edition 4x EK-RAM Monarch Module (Black) 
CoolingCoolingCoolingCooling
EK-XTOP w/ Dual D5 Pumps, EK-X3 250 Res, EK-D5 ... 2x Alphacool NexXxoS UT60 480mm Rads (1x top mo... 2x Alphacool NexXxos UT60 240mm Rads (1x front ... PrimoChill Rigid Acrylic tubing (White), Advanc... 
CoolingCoolingOSMonitor
2x EK-FC Titan X Pascal Nickel GPU Blocks w/ EK... 2x EK-RAM Monarch X4 Nickel/Acetal CSQ RAM Bloc... Windows 10 Pro, 64-bit 1x Acer Predator X34 @ 3440x1440p 34" IPS + 100... 
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Logitech G810 Orion Spectrum EVGA SuperNova P2 1600W Platinum CaseLabs SMA8 (Gunmetal Exterior/Black Interior... Logitech G502 Proteus Core 
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post #363 of 3075
Well, I've just spent five hours playing Fallout 4. This game doesn't like going above 60 FPS, so I maxed the sucker out, and disabled the X34's overclock, and played at 60 FPS.

Away from cities, the game runs like silk on this monitor. Gsync has to be experienced to be believed. And no scan lines of any kind. I mean none.

What can I say - this monitor is astonishing. It's funny though, because I've been testing out (rather than actually playing) many of the games in my library, and last weekend I spent about an hour playing Bioshock Infinite at 100 FPS. It's amazing how quickly you become a snob. 60 FPS suddenly feels like a compromise to me. LOL!

Anyhow, for me, it looks like I have the scan line issue under control. If I get high frame rates, then I overclock to 100fps - no scan lines. If I have low frame rates, then I disable the overclock and aim for 60 FPS - no scan lines, since the overclock is off.

Best monitor I've ever owned... I keep saying that.

So now from here on out it's Fallout 4 all the way. Time to stop tinkering, and start playing. Assassin's Creed Syndicate should be interesting next week. Ubisoft Kiev did the port... so yeah. Get ready for more tinkering.
post #364 of 3075
I see the discussion of the scanlines has moved to this thread.

So, Im posting a bit that i wrote earlier to get the thoughts of the members here:

Warning: Spoiler! (Click to show)
Dear all with scanlines problem,

I think we have been barking up the wrong tree regarding the cause of the scanlines issue. The general consensus so far is to put the blame on G-sync or the Overclocking of this panel. I am going to make the case that it is neither of those two things.

The scanlines are in fact an artifact of running the monitor at LOW REFRESH RATE. Specifically, below 60Hz. I will walk you through the reasoning for why I say this.

We all ran the pendulum demo and switched between G-sync and V-sync/No-V-sync and saw the scanlines come and go. So, we concluded that it is due to G-sync. Actually, what is happening is that when switching to V-synv/No-V-sync in the pendulum demo, we are back at 100Hz (or whatever the max is in your case) and the scanlines vanish. And when we turn G-sync back ON, the refresh rate drops to 40 or 50 or 60 depending on your demo setting and so we see the scanlines return. If you keep in mind the idea that scanlines appear only at low refresh rates, this behaviour makes perfect sense.

To test the idea that it is actually an artifact of only low refresh rate and not G-sync, go to NVCP and turn off G-sync entirely and set the refresh rate to 50Hz. Now go back to the demo and you'll see the scanlines while simulating 50 fps constant. You can't even turn on G-sync now, yet there the scanlines are!

Now repeat the experiment exactly the same way but this time with G-sync ON in NVCP: Switch between G-sync and V-sync/No-V-sync in the demo and see that the scanlines don't vanish or change in intensity. That is because G-sync is not causing it. The low refresh rate of 50Hz is.

People on OCN have already reported that running the pendulum demo at 90-100fps with G-sync ON shows no scanlines. Again, this is because we are running at very high refresh rates (90-100 resp.) and further corroborates my theory that it is not G-sync that is causing the scanlines.

So, what is the lowest refresh rate before we see the scanlines? Since I could only select between 50Hz and 60Hz in NVCP, I tested out both settings and I think there are no scanlines at 60Hz. So, as we go down in refresh rate, somewhere between 50 and 60 Hz, the scanlines start to be visible.

So, I think we should stop calling it G-sync scanlines or OC scanlines. It is simply scan lines due to the monitor running at refresh rates below 60Hz. So, let us call it Low-refresh-rate scanlines.

If it was the monitor OC that was causing the scanlines, we would see it get stronger at higher refreshes. SO, it is definitely not that either. Once again: the take away is that this is a problem related to refresh rates and not OC or G-sync.

When I posted this at the acer forums, two members disagreed based on their own data. So, I'm still on the case.
post #365 of 3075
Mountainlifter,

Your findings are correct.

If I disable Gsync, and drop the display's frequency to 50Hz, then the scanlines appear. For some bizarre and unknown reason, the Nvidia control panel won't allow me to lower my frequency any further than 50hz. On my previous monitor I could set the frequency to whatever I wanted.

Which leads me to suspect two things: 1) Lowering the X34's frequency even further will result in scanlines that will grow increasingly more severe, and 2) Acer has somehow set it up so that we CAN'T lower the frequency of the X34 below 50Hz. They know this problem exists, and they don't want us lowering the frequency because they know what we'll see: scanlines. At 30Hz the scanlines would be obvious to anyone.

My conclusion, Mountainlifter, is the same as yours: the scanlines are not the result of lower frame rates (as was widely suggested), but rather the result of the display running at lower frequencies. It would appear that the scanlines become visible at 50Hz, and presumably worsen as the frequency decreases. (I would love to be able to test that out)

Here's where our monitors differ though. For me, disabling the Acer overclock removes the scanlines completely. I'm 100% certain of this. In fact, I just tested this out in a game. Here's what I did:

1) I overclocked my X34 to 100Hz
2) I disabled Gsync - any scanlines now, presumably, should not be the result of Gsync.
3) I dropped the X34's frequency to 50Hz.

I then ran Fallout 4. Oh, look! Up in the sky! Scanlines! The result, clearly, of running the display at 50Hz. Gsync has nothing to do with this. The frame rate has nothing to do with this. We have a frequency issue here.

These scanlines are obvious and distracting. When looking at the blue sky, all I saw were the scanlines - just terrible. If I had to live with this issue I would return this monitor IMMEDIATELY.

Since the X34 was already displaying at 50Hz, I decided to disable the monitor's overclock, right there, in-game. Since I was below 60Hz, I assumed that doing this wouldn't crash the game - and it didn't. The screen went black for a moment, then came back on, this time running without the overclock, but still at 50Hz.

Bam. The scanlines were gone. (I had already figured this out though. See my posts above. Which is why, last night, I played Fallout 4 for 5 hours without issue. I was playing with Gsync on, and the Acer overclock off. I'm constantly dropping into the 40's in Fallout 4)

(EDIT: I've just realized that Gsync was off when I did this. Happily, I've just tested Fallout 4 at 50Hz, with Gsync on and the overclock off - still no scanlines)

Mountainlifter, are you absolutely certain that disabling the overclock does not remove the scanlines? Do what I did. Try it out with a game. If you have Fallout 4 try it with that.

My conclusion is this:

1) The Acer over-clock is causing scanlines to appear at or below 50Hz - this is a frequency issue.
2) The lower the frequency, the more prominent the scanlines.

So how do you deal with this if your monitor is exhibiting this exact same issue? Just like I said in my posts above. If you have a problematic game... like Fallout 4... like Watch Dogs... like Rome 2... then you disable the Acer overclock, and you accept that your ceiling is 60HZ. No scanlines.

If, on the other hand, your game will always run above 60Hz, then fire up that Acer overclock, and go for 100Hz - no scanlines!

See, this is why I want to be able overclock the X34 on my own. If I have to disable the Acer overclock, then I'd like to have a ceiling of 75hz - not 60Hz. But how? How do you overclock this monitor?


EDIT: I just thought of one other thing. This hugely important.

If you're dead certain that disabling the Acer overclock DOES NOT resolve the scan line issue... in other words, if your ceiling is 60hz with the overclock off, and you have scan lines that grow increasingly prominent as the frequency of your display drops... then you need to return this monitor IMMEDIATLY.

Essentially, if that's the case, then you have a defective panel. No monitor should have scan lines that grow progressively worse as you lower its frequency. Just plain and simple, that's a broken monitor.

Understand the issue first, though. Do exactly what I did above. I'm not convinced that everyone who's returning their monitor does understand the issue. Blind anger will do just that - blind you.


Edit #2

You can reverse the above test, and it works the same.

In other words, you go into a game with your X34 set to 50Hz, and Gsync enabled, and your monitor overclock turned OFF. You shouldn't see scanlines of any kind. (If you do, then I can only conclude you have a defective display.)

Now, while you're still in the game, turn on the overclock on your monitor.

In Fallout 4 the scanlines instantly reappear.
Edited by Mikey- - 11/14/15 at 2:51pm
post #366 of 3075
So Mikey, I tried as you asked. I turned off the OC on my x34 and went in to Control Panel, created a custom res of 100hz and hit test. The "DP" logo came up on screen, but the screen stayed black. Reverted back to 60hz.

So I guess its required to OC through the OSD on the display itself in order to get to 100hz.
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post #367 of 3075

@Mikey- just a little clarification. From what I've understood so far calling it "Acer overclock" is wrong. The overclock function is part of the g-sync module itself from Nvidia, Acer has not coded/made it directly.

 

And unfortunately that means the Asus one will be the same in this regard if they don't fix it by then :doh: 

post #368 of 3075
Quote:
Originally Posted by -terabyte- View Post

@Mikey-
 just a little clarification. From what I've understood so far calling it "Acer overclock" is wrong. The overclock function is part of the g-sync module itself from Nvidia, Acer has not coded/made it directly.

And unfortunately that means the Asus one will be the same in this regard if they don't fix it by then doh.gif  

The scanline issue, now that I understand it, is completely manageable.

The problem is that some people are saying their scan line issue does NOT go away if they disable the overclock. They're claiming that, even with a non-overclocked monitor, with a ceiling of 60Hz, the scan lines still appear, and grow increasingly more prominent as the frequency of the monitor drops.

At least that's what they're claiming.

In which case they need to stop posting and immediately return the monitor. No monitor should do that. That is a completely defective panel.

Mod edit: Please edit posts (the pencil button) instead of double posting.
post #369 of 3075
Quote:
Originally Posted by Mikey- View Post

Mountainlifter,


Mountainlifter, are you absolutely certain that disabling the overclock does not remove the scanlines? Do what I did. Try it out with a game. If you have Fallout 4 try it with that.

My conclusion is this:

1) The Acer over-clock is causing scanlines to appear at or below 50Hz - this is a frequency issue.
2) The lower the frequency, the more prominent the scanlines.

So how do you deal with this if your monitor is exhibiting this exact same issue? Just like I said in my posts above. If you have a problematic game... like Fallout 4... like Watch Dogs... like Rome 2... then you disable the Acer overclock, and you accept that your ceiling is 60HZ. No scanlines.

If, on the other hand, your game will always run above 60Hz, then fire up that Acer overclock, and go for 100Hz - no scanlines!

See, this is why I want to be able overclock the X34 on my own. If I have to disable the Acer overclock, then I'd like to have a ceiling of 75hz - not 60Hz. But how? How do you overclock this monitor?

Mikey, Thanks for the long and detailed post and your contributions to the discussion. Firstly, yes, even with OC OFF, I can see scanlines but not at 50Hz+50fps but at 40Hz+40fps.

This is what I think happens:
1) When OC is OFF in OSD, the possible range of frequencies is 30-60Hz. The higher frequencies of this range do not show scanlines. I start seeing scanlines at 40fps+40hz in this mode but nothing at 50Hz+50fps or at 60Hz+60fps. (I reach 40Hz by using G-sync)
2) When OC is ON in OSD, the possible range of frequencies expands to 30-100Hz. Once again, the higher frequencies of this range do not show scanlines. I start seeing the lines at 60fps+60Hz (w G-sync) and below with this mode.

And I could state that the scanlines artifact appear at lower refresh rates in a range but that wouldn't be true either. Because with OC set to 100Hz on the OSD, if I set the refreshes to any of 80, 85, 90, 95 or 100Hz in NVCP, I start seeing scanlines at 60Hz+60fps and below always.

I am guessing this must be a timing controller (TCON) related artifact which was exactly the same problem the original swift had but with vertical lines. I would have said it was FRC + inversion pattern related issue but if this was so, all panels would have this issue.

EDIT: All scanlines testing is in pendulum demo. Test with a higher than normal brightness in order to not miss scanlines if they are present.

EDIT2: I don't talk about 30Hz+30fps because G-sync behaves different at 30fps and below. http://www.pcper.com/reviews/Graphics-Cards/Dissecting-G-Sync-and-FreeSync-How-Technologies-Differ
Edited by Mountainlifter - 11/14/15 at 6:41pm
post #370 of 3075
Quote:
Originally Posted by Mountainlifter View Post

Mikey, Thanks for the long and detailed post and your contributions to the discussion. Firstly, yes, even with OC OFF, I can see scanlines but not at 50Hz+50fps but at 40Hz+40fps.

This is what I think happens:
1) When OC is OFF in OSD, the possible range of frequencies is 30-60Hz. The higher frequencies of this range do not show scanlines. I start seeing scanlines at 40fps+40hz in this mode but nothing at 50Hz+50fps or at 60Hz+60fps.
2) When OC is ON in OSD, the possible range of frequencies expands to 30-100Hz. Once again, the higher frequencies of this range do not show scanlines. I start seeing the lines at 60fps+60Hz and below with this mode.

And I could state that the scanlines artifact appear at lower refresh rates in a range but that wouldn't be true either. Because with OC set to 100Hz on the OSD, if I set the refreshes to any of 80, 85, 90, 95 or 100Hz in NVCP, I start seeing scanlines at 60Hz+60fps and below always.

I am guessing this must be a timing controller (TCON) related artifact which was exactly the same problem the original swift had but with vertical lines. I would have said it was FRC + inversion pattern related issue but if this was so, all panels would have this issue.

EDIT: All scanlines testing is in pendulum demo. Test with a higher than normal brightness in order to not miss scanlines if they are present.

Mountainlifter,

This is going to surprise you - and I honestly don't understand it myself.

But the pendulum demo scan lines results are NOT the same as the results I'm seeing in-game. I'm not joking. You have to try my test... I can't emphasize this enough... with a real game, not the Pendulum demo.

If you have Watch Dogs, then try that. If you have Fallout 4, then try that. Something about that Pendulum demo is off - it's producing scanlines when the overclock is disabled, whereas in actual games when you disable the overclock the lines go away at any frequency. That's what I'm seeing anyhow.

I know... it makes zero sense.
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