Monitor Tests Forum

Hi ToastyX

I have this TV:
https://www.rtings.com/tv/reviews/sony/x900f

According to this review, it supports 2560x1440@120Hz but I cannot manage to enable it.

I can run fine 3840x2160@60Hz, 1920x1080@120Hz 10-bit but when I select 2560x1440 in Windows settings, it tells me "Desktop Resolution 2560x1440, active signal 3840x2160@60Hz 8-bit with dithering".

Any tip? My card is an AMD RX Vega 64

(03-23-2019 02:29 PM)Amazo Wrote: [ -> ]I have this TV:
https://www.rtings.com/tv/reviews/sony/x900f

According to this review, it supports 2560x1440@120Hz but I cannot manage to enable it.

I can run fine 3840x2160@60Hz, 1920x1080@120Hz 10-bit but when I select 2560x1440 in Windows settings, it tells me "Desktop Resolution 2560x1440, active signal 3840x2160@60Hz 8-bit with dithering".

You need HDMI 2.0 to get 3840x2160 @ 60 Hz 4:4:4 and 2560x1440 @ 120 Hz, but I don't see that in your screenshot. According to the article, "4k @ 60 Hz @ 4:4:4 or 4:2:2 is only possible on HDMI inputs 2 and 3, and only when 'HDMI Enhanced Format' is enabled."

(03-06-2019 08:14 PM)Deusesque Wrote: [ -> ]

(03-06-2019 04:49 PM)ToastyX Wrote: [ -> ]The output is a stream of pixels sent at a fixed rate. The pixel clock is the number of pixels sent per second including blanking. FreeSync is like increasing the vertical blanking in CRU without changing the pixel clock. It always sends at the same rate as 75 Hz and varies the blanking to delay the next refresh. The monitor probably has a limit for how long the blanking period can be. Static 37 Hz doesn't have a delay beyond normal blanking. It just sends at a slower rate.

Appreciate the very clear explanation.
Your explanation made me thinking: what if i minimize the standard blanking so that the freesync induced extra blanking JUST falls into the range of my monitor.

And it worked! It took a lot of tweaking with basically all settings (back/front porch and sync both horizontally and vertically) and now my monitor displays 37-75hz perfectly and i have full LFC now! I only have very rare tearing if the FPS is between 37-38 (i suspect actually it's limited to a decimal range) but that is hardly noticably in practice.

So thanks a lot for your help Toasty!

For others having my monitor (LG 29UM59-P), please find below the settings that worked for me.

Man, I have been having a similar problem for so long, finally your settings worked on my monitor too. I have LG 22MP68VQ, with your settings I am using 37-76Hz, but I gotta ask which radeon driver version are you using?
Because previously I was using my own CRU settings of 37-74Hz with 74Hz being "LCD Reduced" but for some reason I got sever stuttering whenever my FPS drops to 32-37 range with any driver released after 18.6.1, so I am still using 18.6.1 driver to this day. If your settings worked even for newer driver then finally I would upgrade my driver. Cheers!

Edit: I updated to 19.3.3 to give it a shot and to my surprise it works even better than 18.6.1 with your settings, running 37-75Hz, with no issues so far.

Hi guys,
I own an HTPc with an NVIDIA RTX2080 Gpu and Win10. my display is a projector (benq X12000H)
I use it with Madvr and I don't have perfect refresh rate with my films.

So I've used your tool. In the image below you can see the refresh rate that I've with standard Nvidia resolution and the one created with CRU...



My situation now it's better (now 23,977Hz) but still not perfectly right.

Those are the settings used in CRU tool ...



So what I've to set to have perfect 23,976 Hz??

I've tried also with the custom resolution option into Nvidia panel ....



anyway, also with Nvidia custom resolution, madvr continue to tells me that my display is at 23,977hz ....

Please any help.

(03-27-2019 10:52 PM)actarusfleed Wrote: [ -> ]So what I've to set to have perfect 23,976 Hz??

Hardware clocks are not guaranteed to be perfect. You would have to figure out how much the hardware clock is off by and adjust the refresh rate to make up the difference. You can adjust the timing parameters to nudge the refresh rate slightly lower. This calculates the totals needed to get a specific refresh rate: https://www.monitortests.com/pixelclock....=24&rate=1

(03-14-2019 12:15 AM)ToastyX Wrote: [ -> ]

(03-13-2019 08:41 PM)Beagle Wrote: [ -> ]I have a problem that has led me to this thread - I've just upgraded all my hardware except for my old Apple Cinema Display 30" which has a native res of 2560x1600 and that I've been using on 1920x1200 for the past couple of years. For reasons that remain a mystery to me, the new system is using a res of 1280x800 and I can't seem to get it any higher.

I'm connecting the display via a DVI (dual link) to DisplayPort adapter to my RTX2080, and I've updated my drivers for the card which I initially thought would solve the problem.

I've managed to set-up a new profile in CRU, pressed OK, reset.exe, went to display settings and selected the new resolution, the display goes black for a few seconds during which time the power button on the display flashes intermittently as if it is working, when the picture reappears it defaults back to 1280x800.

It sounds like you have a single-link DVI adapter, not dual-link. A dual-link DVI adapter would have a USB connection for power like this: https://www.amazon.com/dp/B00856WJH8/?tag=mtests-20#ad

The 30" Apple also doesn't have a scaler, so it only supports 2560x1600 and 1280x800 natively. The graphics driver automatically adds some common lower resolutions as scaled resolutions, which is how you had 1920x1200 before, but without 2560x1600 available, it only adds resolutions lower than 1280x800. When you add 1920x1200 with CRU, you're adding a non-scaled resolution that's sent to the monitor, but the monitor doesn't support 1920x1200, so you get a black screen. You need to get a proper dual-link DVI adapter. Then 1920x1200 will probably be available automatically without needing to use CRU.

This solution worked great for me and I never would have found it without you. Thanks for your help. My donation is scheduled for the beginning of April. Keep up the great work.

(03-29-2019 09:02 PM)ToastyX Wrote: [ -> ]

(03-27-2019 10:52 PM)actarusfleed Wrote: [ -> ]So what I've to set to have perfect 23,976 Hz??

Hardware clocks are not guaranteed to be perfect. You would have to figure out how much the hardware clock is off by and adjust the refresh rate to make up the difference. You can adjust the timing parameters to nudge the refresh rate slightly lower. This calculates the totals needed to get a specific refresh rate: https://www.monitortests.com/pixelclock....=24&rate=1

Hi , It's not completely clear to me how to use the tool you linked to me ...

In this screenshot I've only entered the desired refresh rate ...is it right?
What I've to do?? Thank you so much for any help...

(03-30-2019 09:53 AM)actarusfleed Wrote: [ -> ]Hi , It's not completely clear to me how to use the tool you linked to me ...

In this screenshot I've only entered the desired refresh rate ...is it right?
What I've to do?? Thank you so much for any help...

It calculates the pixel clock and horizontal/vertical totals required to get a specific refresh rate. You'll have to figure out how much the hardware clock is off by and adjust the refresh rate accordingly.

(03-30-2019 02:15 PM)ToastyX Wrote: [ -> ]

(03-30-2019 09:53 AM)actarusfleed Wrote: [ -> ]Hi , It's not completely clear to me how to use the tool you linked to me ...

In this screenshot I've only entered the desired refresh rate ...is it right?
What I've to do?? Thank you so much for any help...

It calculates the pixel clock and horizontal/vertical totals required to get a specific refresh rate. You'll have to figure out how much the hardware clock is off by and adjust the refresh rate accordingly.

Thank you but it still not clear to me sorry.
Can you suggest me "stop-by-step" what I've to do in my case?

just like you're explaining it to a child...

infinite thanks

(03-30-2019 04:35 PM)actarusfleed Wrote: [ -> ]Thank you but it still not clear to me sorry.
Can you suggest me "stop-by-step" what I've to do in my case?

just like you're explaining it to a child...

infinite thanks

The detailed resolution you showed me has totals 4400x2250 and pixel clock 237.37 MHz:

237370000 / 4400 / 2250 = 23.97676... Hz

Your screenshot shows 23.97797 Hz:

23.97676... - 23.97797 = -0.0012023...

That's how much it's off by. So you need:

23.97676... - 0.0012023... = 23.9755653... Hz

If you put 23.9755653 Hz into the pixel clock calculator, it will give you the pixel clock and horizontal/vertical totals needed to get close to that refresh rate: https://www.monitortests.com/pixelclock....23.9755653

Both CRU and the NVIDIA control panel have horizontal/vertical totals that you can enter manually. CRU also lets you type in the pixel clock instead of the refresh rate, while the NVIDIA control panel only lets you type in the refresh rate.

The easiest thing to try first would be to simply change the custom resolution refresh rate to 23.975 Hz, since it's off by around 0.001 Hz.

If you want to tweak it further, try entering the values given by the pixel clock calculator. Keep in mind the projector might not be able to handle certain horizontal/vertical total combinations, so you might want to test with the NVIDIA control panel first.

If I put the 560 horizontal blanking in the pixel clock calculator, I get something close that should work:

237.78 MHz 4400 x 2254 @ 23.975558603 Hz (-0.000006697 Hz)

Simply change the custom resolution totals to 4400x2254 and the pixel clock to 237.78 MHz, and it should be closer to what you want. Keep in mind that measurements are not exact either because Windows is not a real-time operating system, but this should reduce the number of frame repeats.

Here's another guide that goes into detail: https://forum.doom9.org/showthread.php?t=173571