XL2411Z V2, my findings so far [settings, VT1500 trick, etc]

Adjusting BENQ Blur Reduction and DyAc (Dynamic Acceleration) including Blur Busters Strobe Utility. Supports most BenQ/Zowie Z-Series monitors (XL2411, XL2420, XL2720, XL2735, XL2540, XL2546)
victor123
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Joined: 28 Apr 2015, 19:23

Re: XL2411Z V2, my findings so far [settings, VT1500 trick,

Post by victor123 » 29 Apr 2015, 17:20

Falkentyne wrote:Um, the first answer is, why don't you test it for yourself? Your computer doesn't bite.....try it out and see if you like it or not. You already own the monitor, so I Think it would be much faster for you to try out these settings by yourself and see if it works for you, than waiting for a reply on forums (I'm a bit busy).

Second, Vertical total tweaks do nothing if blur reduction is off, as it's a tweak to increase the vertical blanking interval period from 0.5 ms to around 4 ms (that gives the screen more time to complete a pixel refresh (which in turn, lowers the amount of strobe crosstalk (NOT to be confused with AMA/ghosting/overdrive). However, since the blanking interval is increased when the resolution is active, the monitor is being run way out of specifications. The Benq was actually designed to accept vertical total tweaking, while an identical panel (the Asus VG248QE) will instantly black screen out of range at any VT over the end of the lightboost range (around VT 1200). that's because lightboost mode uses an LC panel update to accelerate the scanout, to help the panel do a refresh faster. It's basically the SAME Thing as the VT tweak except its done through the LC panel, but the actual effect is the same (you can see it if you enable lightboost mode at 100 hz refresh rate and test the crosstalk at the bottom area of the screen and compare it to VT 1500 blur reduction (Strobe phase 000):
http://www.testufo.com/#test=photo&phot ... &height=-1

However when using a VT tweak, the panel is run out of specification and the scaler itself gets confused and thinks another resolution is running. This causes the "Display mode" aspect ratios to not work correctly and causes "Aspect" to suddenly be selectable at 1920x1080, because due to the increase in VT, the internal scaler thinks the monitor is being run at 1280x1440.

Using a VT tweak can cause a strange scanlines effect on the desktop, particularly on light backgrounds, due to the panel being run out of designed limits. This causes NO effect on lifetime or durability, but some panels may have a very obvious scanlines effect while others may not. Lightboost mode pushes the scanout even harder than a VT 1502 tweak does, so the scanlines will be even more intense in lightboost mode. This varies from panel to panel.

If this is a problem for you, you can create a custom resolution without the VT tweak, which will be at the same refresh rate.
The trick to that is, to make the refresh rate a fraction. e.g. 100.500 hz at 1125 (default) vertical total, or 120.500 hz. This was a popular trick during the Lightboost days when people didn't want the ugly washed out contrast and purple tint and wanted LB disabled.
Hello,
Thanks for the answer. I tried to do the last thing you said but I can't create custom resolutions in the Nvidia Panel Control with fractions like 120.500hz :(

Falkentyne
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Re: XL2411Z V2, my findings so far [settings, VT1500 trick,

Post by Falkentyne » 29 Apr 2015, 17:22

Use ToastyX CRU, then.

http://www.monitortests.com/forum/Threa ... tility-CRU

This will let you do it.
That's the same site that has the pixel clock patcher and the driver restarter.

The main benefit of the Nvidia control panel over CRU is, you can test custom resolutions before they are saved (so you can see which ones will go out of range without risking actually having them applied). You can also add more than 4 detailed resolutions.

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Razorless
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Re: XL2411Z V2, my findings so far [settings, VT1500 trick,

Post by Razorless » 22 Nov 2015, 10:45

Anyone still got the timings for 60Hz? The imgae of the first post vanished.

Falkentyne
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Re: XL2411Z V2, my findings so far [settings, VT1500 trick,

Post by Falkentyne » 22 Nov 2015, 10:57

For displayport, you can just use HT 2080 and VT 1354, should work perfectly. (VT 1360 may work too. I think VT 1350 was frameskipping on my XL2720Z. I know VT 1350 frameskips at 100hz while VT 1354 is 100% flawless (on XL2720Z).

For DVI, I talked with Masterotaku and we found that the problem is the border between the single and dual link pixel clocks. The toastyX pixel clock patcher patches both the single and dual link clocks, so if the monitor is expecting a dual link signal and receives a SINGLE LINK signal that has been extended to a higher clock, you get the "Cable error." This doesn't apply over displayport. (you still can't use VT 1497-Vt 1502 at 60hz even over displayport. yet 61hz works perfectly...no idea why).

Masterotaku avoided that by increasing the horizontal total, which raises the pixel clock. Yon can try that too.
I think the HT he used was 2816.

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Razorless
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Re: XL2411Z V2, my findings so far [settings, VT1500 trick,

Post by Razorless » 22 Nov 2015, 11:13

I don´t have a display port cable so I can only test DVI dual link and 60Hz 2816/1354 (with 120Hz timings) gives "incorrect cable error".

I know he had some crazy timings along with the VT of 2816.

Falkentyne
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Re: XL2411Z V2, my findings so far [settings, VT1500 trick,

Post by Falkentyne » 22 Nov 2015, 11:50

Found them.

1920x1080, 60hz.

Front porch 250, 10
Sync width 300, 30
HT: 2876
VT: 1360.

Pixel clock should be 234.69 mhz.
(only needed for DVI).
BTW there may be a way to NOT have to use these timngs.

if you rename the toastyX pixel clock patcher and put a -DL (or -dl) at the end of the file name (before the .exe extension), it will not patch the single link DVI limits. Then you should be able to use the normal timings and 2080 HT and 1354 vertical total (anything in the range of 1350-1360 that does NOT cause frameskipping). This will break a few low resolutions like 1280x960@100hz, but will make 1920x1080@85hz (default VT) work without a cable error. With the single link limits patched you will get a cable error if you attempt to use 1920x1080@85hz (default automatic timings) without a VT tweak, but it will work with a VT 1501 tweak.

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Razorless
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Re: XL2411Z V2, my findings so far [settings, VT1500 trick,

Post by Razorless » 22 Nov 2015, 13:00

Falkentyne wrote:Found them.

1920x1080, 60hz.

Front porch 250, 10
Sync width 300, 30
HT: 2876
VT: [1360.
...
Thanks, it works.
BTW there may be a way to NOT have to use these timngs.
....
Is there a disadvantage over not using these timings? Increased latency or something similar?

Falkentyne
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Re: XL2411Z V2, my findings so far [settings, VT1500 trick,

Post by Falkentyne » 22 Nov 2015, 13:58

Basically, if it works, it works.
The only problem is when the scaler doesn't like the timings for some reason, even though the cable or the panel can technically handle it.

for example:
These timings create artifacts:

1920x1080 @ 120hz
Front porch: 88, 4
Sync width: 44, 5
Horizontal total: 2200
Vertical total: 1500.
Pixel clock: 396.00 MHz

Yet:
THESE timings do NOT:

1920x1080 @ 125hz
Front porch: 48, 3
Sync width: 32, 5
Horizontal total: 2080
vertical total: 1502
Pixel clock: 390.02.

And it's NOT because of the pixel clock being 6 MHz lower, either.
Nor is it the dvi cable, because the same artifacts happen over displayport.

If its the pixel clock, then explain why this works?
(This will only work over displayport; DVI TDMS hardware limits are exceeded; 100hz over DVI will work however).

2560x1440 @ 115 hz
Front porch: 48, 3
Sync width: 32, 5
Horizontal total: 2641
Vertical total: 1497
Pixel clock: 454.67 MHz

454.67mhz no artifacts.
1 more hz (even 116hz) or higher HT however starts getting artifacts...

I asked toastyX about it, he said it's a scaler limitation, as Qinx monitors do the same thing if they cant overclock to 2560x1440@120hz.

Miketech
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Joined: 30 Nov 2015, 15:51

Re: XL2411Z V2, my findings so far [settings, VT1500 trick,

Post by Miketech » 02 Dec 2015, 09:47

Even though I am using the 60hz and a 120hz VT tweak I am getting a lot of ghosting and I have no idea why. When I turn off blur reduction while playing dyling light I don't notice any ghosting but when I turn it back on and move my mouse left and right somewhat fast, there is a lot of ghosting.
(I was using my 60hz settings. Even tried my 120hz settings to see if anything different would happen but still the same.)

I have made a setting for 85hz and when viewing the blur buster moving photo the ghosting on the image is a lot less visible compared to when I use my 120hz settings.

Anyone know why this is happening? If you need me to give you more detail then let me know.

Falkentyne
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Joined: 26 Mar 2014, 07:23

Re: XL2411Z V2, my findings so far [settings, VT1500 trick,

Post by Falkentyne » 02 Dec 2015, 10:05

Please explain what you mean by ghosting, please.
Multiple copies of the image of the mouse cursor when moving the cursor fast is not ghosting. that's a normal stroboscopic effect from fast motion.

Inverse RTA artifacts are from overdrive. Please be more direct in what you are referring to.
Are you talking about images that look like
http://us.hardware.info/reviews/5606/6/gaming-monitors-review-on-overdone-overdrive-test-samplen2

http://us.hardware.info/reviews/5606/6/ ... t-samplen2

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