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75hz downgrades resolution?
posted in Hardware
1
#1
0 Frags +

So, I recently discovered my monitor can put out 75hz. I'm trying to enable that via the AMD Catalyst Control Center.

But, when I do change refresh rate to 75hz, it changes my resolution from the native 1366 x 768 to 1024 x 768. That makes everything the image quality really poor. Does anyone know why this is happening, and how I can fix it so I can get 75hz with 1366 x 768?

Thanks very much for your help, I really appreciate how helpful the community has been to me!

[I have an R9 270 video card and I don't remember the monitor model off the top of my head but I'll post it as soon as I can if anyone wants to know it.]

So, I recently discovered my monitor can put out 75hz. I'm trying to enable that via the AMD Catalyst Control Center.

But, when I do change refresh rate to 75hz, it changes my resolution from the native 1366 x 768 to 1024 x 768. That makes everything the image quality really poor. Does anyone know why this is happening, and how I can fix it so I can get 75hz with 1366 x 768?

Thanks very much for your help, I really appreciate how helpful the community has been to me!

[I have an R9 270 video card and I don't remember the monitor model off the top of my head but I'll post it as soon as I can if anyone wants to know it.]
2
#2
3 Frags +

Well, in order to power 75Hz, it has to drop resolution because it can't overdrive the whole monitor, only part of it. There's no fix to it. If you want 75Hz, the resolution must go down.

Well, in order to power 75Hz, it has to drop resolution because it can't overdrive the whole monitor, only part of it. There's no fix to it. If you want 75Hz, the resolution must go down.
3
#3
2 Frags +

I believe this is similar to mine, my native res is 1680x1050 but can only get 60hz.
If I want 75hz I have to go 1440x900 or lower.
Just the way it is, brotha

I believe this is similar to mine, my native res is 1680x1050 but can only get 60hz.
If I want 75hz I have to go 1440x900 or lower.
Just the way it is, brotha
4
#4
0 Frags +

That's too bad but oh well. Thanks for the help!

That's too bad but oh well. Thanks for the help!
5
#5
1 Frags +

You can check the list of supported resolutions for your monitor. 1024x768 is probably the highest supported resolution @ 75Hz for your monitor.

You can check the list of supported resolutions for your monitor. 1024x768 is probably the highest supported resolution @ 75Hz for your monitor.
6
#6
2 Frags +
AlkalineSo, I recently discovered my monitor can put out 75hz. I'm trying to enable that via the AMD Catalyst Control Center.

But, when I do change refresh rate to 75hz, it changes my resolution from the native 1366 x 768 to 1024 x 768. That makes everything the image quality really poor. Does anyone know why this is happening, and how I can fix it so I can get 75hz with 1366 x 768?

Thanks very much for your help, I really appreciate how helpful the community has been to me!

[I have an R9 270 video card and I don't remember the monitor model off the top of my head but I'll post it as soon as I can if anyone wants to know it.]

If you input everything manually (and optimize) over single link dvi and vga 75Hz can be achieved at 1680 x 1050, 1440 x 900 is a lot easier to get though. For a 16 x 9 res 1366 x 768 should easily be possible.

[quote=Alkaline]So, I recently discovered my monitor can put out 75hz. I'm trying to enable that via the AMD Catalyst Control Center.

But, when I do change refresh rate to 75hz, it changes my resolution from the native 1366 x 768 to 1024 x 768. That makes everything the image quality really poor. Does anyone know why this is happening, and how I can fix it so I can get 75hz with 1366 x 768?

Thanks very much for your help, I really appreciate how helpful the community has been to me!

[I have an R9 270 video card and I don't remember the monitor model off the top of my head but I'll post it as soon as I can if anyone wants to know it.][/quote]

If you input everything manually (and optimize) over single link dvi and vga 75Hz can be achieved at 1680 x 1050, 1440 x 900 is a lot easier to get though. For a 16 x 9 res 1366 x 768 should easily be possible.
7
#7
0 Frags +
ComangliaIf you input everything manually (and optimize) over single link dvi and vga 75Hz can be achieved at 1680 x 1050, 1440 x 900 is a lot easier to get though. For a 16 x 9 res 1366 x 768 should easily be possible.

I'm not good at this stuff, so bear with me. What precisely do I need to do to get this to work? Currently the monitor is hooked up over hdmi, do I need to replace that with another cable and try it? Sorry for technical incompetence, I appreciate the help.

[quote=Comanglia]
If you input everything manually (and optimize) over single link dvi and vga 75Hz can be achieved at 1680 x 1050, 1440 x 900 is a lot easier to get though. For a 16 x 9 res 1366 x 768 should easily be possible.[/quote]

I'm not good at this stuff, so bear with me. What precisely do I need to do to get this to work? Currently the monitor is hooked up over hdmi, do I need to replace that with another cable and try it? Sorry for technical incompetence, I appreciate the help.
8
#8
0 Frags +

hdmi isn't really the best option for a monitor, so it would be a good idea to use another method

hdmi isn't really the best option for a monitor, so it would be a good idea to use another method
9
#9
0 Frags +

You just have to mess with the monitor timings. I suggest CRU/using the nvidia control panel to do it. http://www.monitortests.com/cru-1.1.2.zip

And about HDMI not being the "best option", that's true. I mean, it won't really bottleneck you here; I was able to get my planar sa2311w running @ 120Hz via HDMI 1.3 with custom timings I made (Laptop only has 1 thunderbolt port, so I can't run both monitors @ 120hz unless I do this).

Overall, you're limited by your monitor, so don't go crazy once you get 75Hz @ native lol

You just have to mess with the monitor timings. I suggest CRU/using the nvidia control panel to do it. http://www.monitortests.com/cru-1.1.2.zip

And about HDMI not being the "best option", that's true. I mean, it won't really bottleneck you here; I was able to get my planar sa2311w running @ 120Hz via HDMI 1.3 with custom timings I made (Laptop only has 1 thunderbolt port, so I can't run both monitors @ 120hz unless I do this).

Overall, you're limited by your monitor, so don't go crazy once you get 75Hz @ native lol
10
#10
serveme.tf
1 Frags +

You'll want to check if your monitor even does 75Hz properly without frame skipping.

You'll want to check if your monitor even does 75Hz properly without frame skipping.
11
#11
0 Frags +
Dave_You just have to mess with the monitor timings. I suggest CRU/using the nvidia control panel to do it. http://www.monitortests.com/cru-1.1.2.zip

This is what I use, I would just edit one of the Native Resolutions if I was you and change the Timing to LCD reduced and set it to 75Hz.

ArieYou'll want to check if your monitor even does 75Hz properly without frame skipping

http://www.testufo.com/#test=frameskipping use this if it says "Valid" at the bottom you're good.

As for the HDMI bit
HDMI has plenty of bandwidth for 144Hz at 1080p (HDMI 1.4 and 2.0) 75Hz at 768p should be not a problem at all, the real issue with HDMI is that it creates Input Lag (10-30ms approx.)

Dual Link DVI, High Quality VGA (such as cables that come attached to Diamondtron and Trinitron CRTs), and Display Port (also carries audio if that's what you use HDMI for but not every monitor has it) are the best cables to have for low input latency and high bandwidth.

[quote=Dave_]You just have to mess with the monitor timings. I suggest CRU/using the nvidia control panel to do it. http://www.monitortests.com/cru-1.1.2.zip[/quote]

This is what I use, I would just edit one of the Native Resolutions if I was you and change the Timing to LCD reduced and set it to 75Hz.

[quote=Arie]You'll want to check if your monitor even does 75Hz properly without frame skipping[/quote]

http://www.testufo.com/#test=frameskipping use this if it says "Valid" at the bottom you're good.

As for the HDMI bit
HDMI has plenty of bandwidth for 144Hz at 1080p (HDMI 1.4 and 2.0) 75Hz at 768p should be not a problem at all, the real issue with HDMI is that it creates Input Lag (10-30ms approx.)

Dual Link DVI, High Quality VGA (such as cables that come attached to Diamondtron and Trinitron CRTs), and Display Port (also carries audio if that's what you use HDMI for but not every monitor has it) are the best cables to have for low input latency and high bandwidth.
12
#12
serveme.tf
1 Frags +
Comangliahttp://www.testufo.com/#test=frameskipping use this if it says "Valid" at the bottom you're good.

"Valid" just means your browser isn't messing up the test. You'd need to follow the instructions and take a picture of the screen so you can check for frame skipping.

[quote=Comanglia]http://www.testufo.com/#test=frameskipping use this if it says "Valid" at the bottom you're good.
[/quote]

"Valid" just means your browser isn't messing up the test. You'd need to follow the instructions and take a picture of the screen so you can check for frame skipping.
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