I can't get mine over 179hz.
https://i.imgur.com/LM5QZyP.png
BenQ XL2720Z overclocked to 220Hz and 250Hz [SUCCESS!]
Re: BenQ XL2720Z overclocked to 220Hz and 250Hz [SUCCESS!]
Is it 250 Hz at 1080p? With what settings exactly did you manage to run it at 250 Hz?
How did you manage to go over 480 mHz DisplayPort limit?
When I set resolution in CRU and go over 480 mHz:
This refresh rate refuses to show up in the list of refresh rates:
222 Hz with these settings shows just fine because it doesn't go over 480 mHz:
Is it me or is it the same for everyone and it just stops showing up in the list if you create a resolution over 480 mHz?
Re: BenQ XL2720Z overclocked to 220Hz and 250Hz [SUCCESS!]
I don't have any settings like this. Does it use YCbCr422 automatically when you go over some bandwidth?
I managed to make it work alright at 262 Hz(DisplayPort and DVI-D with ToastyX's pixel clock patcher) without frameskipping using these settings:
Then at 263 Hz it black-screens.
Also managed to make 264 Hz work with these settings:
But it's flickering and is not really usable.
I'd prefer to use 250 Hz @ 1080p than these settings, I don't know how to make refresh rates over 480 mHz appear in the list.
Re: BenQ XL2720Z overclocked to 220Hz and 250Hz [SUCCESS!]
Yes. I'm really not sure how. I'm using a DisplayPort cable and NVIDIA graphics card. What could different to your setup is I'm using Zowie V008 firmware and Zowie XL display driver (BENQ display driver makes no difference though). Is that what allows me to go to 540MHz, or is it something else? I really don't know.
These are my settings at 1080p using a DisplayPort cable, pushed to the limit (540MHz?)
Just noticed you're using an AMD card. I assume that has something to do with it... maybe someone else can confirm?
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Re: BenQ XL2720Z overclocked to 220Hz and 250Hz [SUCCESS!]
I haven't tested higher than 165hz because 6 BPC looks like total garbage. Might be ok in some FPS games (you get the same issue with 125hz with a VT 1497-VT 1502 tweak (range due to certain VT's frameskipping), due to pixel clock > 359.99 mhz. Blur reduction does work however, although the crosstalk sucks.loopy750 wrote: ↑14 Oct 2020, 13:34Yes. I'm really not sure how. I'm using a DisplayPort cable and NVIDIA graphics card. What could different to your setup is I'm using Zowie V008 firmware and Zowie XL display driver (BENQ display driver makes no difference though). Is that what allows me to go to 540MHz, or is it something else? I really don't know.
These are my settings at 1080p using a DisplayPort cable, pushed to the limit (540MHz?)
file.png
Just noticed you're using an AMD card. I assume that has something to do with it... maybe someone else can confirm?
I would honestly like to try 220hz with blur reduction enabled, but I have a feeling MBR won't work at all, or trying to use it will either cause the monitor to power cycle trip or no backlight.
BTW Something I noticed which may help some of you.
The "Strobe persistence" base settings, depends on the resolution you used BEFORE switching to 165hz. This is important.
For example, at 60hz, the persistence settings are 0.167ms per point of strobe duty. At 120hz it's 0.83ms and at 144hz it's 0.69ms.
If you have a VT tweak active, example, at 120hz/100hz, VT 1500 for instance, this forces the monitor to use the 60hz strobe pulse widths (0.167ms). That's another reason why the monitor is brighter when you use a VT Tweak, and the "maximum" strobe phase before the backlight shuts off is reduced (100hz=phase 059, 120hz=phase 049, 125hz=phase 047 I think are the "Cutoff points" when using a VT Tweak). When you use 165hz, it seems like the strobe pulse widths are the ones used BEFORE switching to 165hz! This sort of makes sense, since the firmware doesn't recognize 165hz.
This is important ONLY if you are using blur reduction. A 60hz strobe pulse width at 165hz will have the monitor EXTREMELY BRIGHT at a strobe duty of 008 (almost as bright as 120hz with VT 1500 active at strobe duty 030 !! Note that 120hz with strobe duty 030 is nowhere near as bright), which comes very close to the trip point where the monitor will power cycle from over-driving the LEDs! I recommend no higher than a strobe phase of 005 for normal daytime blur reduction if you are switching "from" a 60hz strobe persistence pulse width with a VT Tweak active, and 004 for no background light nighttime.
If you switch from 144hz to 165hz and MBR is very dim, it will use the 0.69ms pulse widths and you will probably need a strobe duty of 015 for decent brightness. If you try strobe duty 015 if it's using the 60hz strobe pulse widths, the monitor will probably instantly power trip. And if it doesn't, you're risking damaging or destroying the backlight so be careful. Start with Strobe Duty 006 to be safe. If it's super bright with MBR on, it's using the 60hz pulse widths. If it's very dim, it's using "default" pulse widths.
I have NOT tested whether this "bug" happens if you switch from a standard refresh rate without a VT Tweak active (e.g. 60hz stock, 100 hz stock, 120hz stock), as I have VT tweaks for reduced crosstalk for everything except 144hz.
I also don't know if higher vertical totals at the 165hz setting will work for reducing strobe crosstalk or not. I'm 99% sure already VT 1500 definitely won't work (even though you can get the pixel clock down to like 450 mhz by reducing the front porch and horizontal total). VT 1350 may or may not work. Haven't tried; most likely the monitor would either refuse to sync at all or would display complete garbage on the screen. If someone wants to try and see if crosstalk reduction works on "Test UFO, Alien invasion", be my guest.
Has anyone used blur reduction successfully at >180-220hz?
Re: BenQ XL2720Z overclocked to 220Hz and 250Hz [SUCCESS!]
I keep reading about 6 BPC and 8 BPC but it looks exactly the same at 144 Hz and 222 Hz. Here are photos:Falkentyne wrote: ↑17 Oct 2020, 16:51I haven't tested higher than 165hz because 6 BPC looks like total garbage.
They look exactly the same on camera and for my eyes.
Though, it does show 8 bpc at 144 Hz and 6 bpc at 222 Hz:
When I started reading about that it looks bad, I was expecting 6-bit RGB, something like this:
But it looks just fine as you can see on the photos above.
Last edited by Kulagin on 21 Oct 2020, 14:46, edited 1 time in total.
Re: BenQ XL2720Z overclocked to 220Hz and 250Hz [SUCCESS!]
Yes, works just fine at 222(1920x1080) and 264 Hz(1600x900) for me:
Didn't experience anything like that yet.Falkentyne wrote: ↑17 Oct 2020, 16:51I would honestly like to try 220hz with blur reduction enabled, but I have a feeling MBR won't work at all, or trying to use it will either cause the monitor to power cycle trip or no backlight.
I'm on V4 firmware.
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Re: BenQ XL2720Z overclocked to 220Hz and 250Hz [SUCCESS!]
The 6 bpc problem can't be seen here.Kulagin wrote: ↑21 Oct 2020, 14:33I keep reading about 6 BPC and 8 BPC but it looks exactly the same at 144 Hz and 222 Hz. Here are photos:Falkentyne wrote: ↑17 Oct 2020, 16:51I haven't tested higher than 165hz because 6 BPC looks like total garbage.
They look exactly the same on camera and for my eyes.
Though, it does show 8 bpc at 144 Hz and 6 bpc at 222 Hz:
When I started reading about that it looks bad, I was expecting 6-bit RGB, something like this:
But it looks just fine as you can see on the photos above.
The problem with 6bpc can be best seen in the game Overwatch, where the gradients end up very sharp and annoying. Watchpoint: Gibraltar I think shows this the best.
I only saw this issue on Radeon cards (I last tested that with a r9 290X). My Vega 64 died right after I ordered my RTX 3090 FE, and I'm not going to remove the RTX card to put in my spare r9 290X to look at this issue again (it's on a backup Z490 board but I have no games installed except Minecraft, so I don't know how I can test it for it on that system.
On the RTX 3090, when I use 125hz with VT 1502 tweak (this forces 6 bpc because the pixel clock is 389.22), the color format changes from RGB to YCbCR422, but is still in 8 bit color. This seems to prevent the excessive banding from happening, although the colors start looking a bit off. The AMD video card remains in RGB, which is why it switches to 6 bit color. ToastyX mentioned on his forum he isn't sure how to make the AMD card use YCbCR422 at >360 mhz pixel clock.
Because the last time I even looked at this issue was back in 2016, I have no idea if it still happens. I don't even remember if I was using windows 7 or 10 either.
Re: BenQ XL2720Z overclocked to 220Hz and 250Hz [SUCCESS!]
I also never noticed degraded colors when OCing my XL2411Z, it only becomes brighter and gets somewhat visible horizontal lines with space between them dependent on refresh rate. How do I reliably tell at what BPC I am (NVIDIA)? Shows 8 here:
BenQ XL2546K @ 240Hz (DyAC+) • ROCCAT Kone Pro Air @ 1000Hz • HyperX Alloy Origins • CORSAIR MM350 PRO Premium • HyperX Cloud Revolver • NVIDIA GeForce RTX 3070 @ 2130MHz/8000MHz • Intel Core i7-8700K @ 4.8GHz • G.SKILL RipjawsV 16GB (2x8GB) 3000MHz CL15
Re: BenQ XL2720Z overclocked to 220Hz and 250Hz [SUCCESS!]
Got 264 Hz working so far:
Settings:
Black-screens when set to 265 Hz. Tried to lower the resolution to 720p but it still black-screens. Didn't go any lower than that. I wonder, what would be the bottleneck now?
Update. I noticed that I get single green pixels around the screen. Is that something I should worry about? Is there a fix for this?
Settings:
Black-screens when set to 265 Hz. Tried to lower the resolution to 720p but it still black-screens. Didn't go any lower than that. I wonder, what would be the bottleneck now?
Update. I noticed that I get single green pixels around the screen. Is that something I should worry about? Is there a fix for this?