safe up'ing refresh rate?

U

UberPooner

Limp Gawd
Joined
Jul 21, 2005
Messages
435
Hi, i have a viewsonic vx922 monitor. the current refresh rate is 60hertz. i was wondering if my monitor would be safe running like around 85 hertz? do you think so or not so?
 
refresh rate does not apply to LCD's, they default to 60Hz in windows, if you go above the monitors specs it will just simply not display anything. However with an LCD you will not see any difference, IMO, when changing the refresh rate. LCD's are rated at pixel resfresh rate, which is its rating in MS, ex. 8ms. I have run mine at both 60Hz and 75Hz and cant notice any difference, I have a VX2025 btw.
 
Raising the refresh rate will not damage an LCD monitor. That's only a concern with CRT monitors.

Raising the refresh rate on an LCD monitor may not give you the results you're looking for because many LCD monitors will only output 60 frames per second regardless, so if you set a higher refresh rate, such as 75 Hz, it will just skip every 5th frame. I don't know if the VX922 is any different.
 
Well I'm no technical genius, but I have the 922 and I set it to 75htz, the highest spec allowed by the monitor and I've tried higher. I do that because believe it or not it does help a little in the screen tearing department... Well it's noticably better to me anyways.
 
ToastyX said:
Raising the refresh rate on an LCD monitor may not give you the results you're looking for because many LCD monitors will only output 60 frames per second regardless,
Click to expand...


Not true with the faster TN and overdrive panels. An 8ms "refresh" gives you a theoretical 125fps upper limit before tearing will occur. (1000 divided by 8). Since most LCD's are not true with all colors, 8ms response time, you can still get more than 60fs without tearing.
 
TheRapture said:
Not true with the faster TN and overdrive panels. An 8ms "refresh" gives you a theoretical 125fps upper limit before tearing will occur. (1000 divided by 8). Since most LCD's are not true with all colors, 8ms response time, you can still get more than 60fs without tearing.
Click to expand...
The response time has no effect on tearing and has nothing to do with the refresh rate. The refresh rate controls how many frames are sent to the monitor per second, and it's up to the monitor to process those frames. All of the LCD monitors I've used will skip frames if the refresh rate is set higher than 60 Hz. There's really no reason for such a limitation to exist, so I'm sure it's possible to have monitors that don't do that. I don't know if the VX922 does or not.
 
ToastyX said:
The response time has no effect on tearing and has nothing to do with the refresh rate. The refresh rate controls how many frames are sent to the monitor per second, and it's up to the monitor to process those frames. All of the LCD monitors I've used will skip frames if the refresh rate is set higher than 60 Hz. There's really no reason for such a limitation to exist, so I'm sure it's possible to have monitors that don't do that. I don't know if the VX922 does or not.
Click to expand...


Yes it does....if the display can cycle the pixels to the requested color fast enough, you get less ghosting and more frames per second without the display skipping over a frame. My display certainly does not skip frames when I have it set to 75hz (using VGA connection), in fact, in Q3A I cap my fps to 125 in game and get quite smooth, tear free with Vsync OFF. Using DVI of course it is limited to 60hz, but I certainly do see more than 60fps with no tearing.


Maybe you have not tried a faster/newer LCD? (I really don't know, not being mean).
 
TheRapture said:
Yes it does....if the display can cycle the pixels to the requested color fast enough, you get less ghosting and more frames per second without the display skipping over a frame. My display certainly does not skip frames when I have it set to 75hz (using VGA connection), in fact, in Q3A I cap my fps to 125 in game and get quite smooth, tear free with Vsync OFF. Using DVI of course it is limited to 60hz, but I certainly do see more than 60fps with no tearing.


Maybe you have not tried a faster/newer LCD? (I really don't know, not being mean).
Click to expand...


+1...That monitor and 125fps in q3 is very smooth at 75hz. Very little tearing.
 
The response time has nothing to do with how many frames are displayed. Frames are sent from the video card to the monitor at the refresh rate. A higher refresh rate can help reduce visible tearing regardless of whether or not the monitor skips frames, but if it skips frames, motion may seem jittery.
 
ToastyX said:
The response time has nothing to do with how many frames are displayed. Frames are sent from the video card to the monitor at the refresh rate. A higher refresh rate can help reduce visible tearing regardless of whether or not the monitor skips frames, but if it skips frames, motion may seem jittery.
Click to expand...



this I understand. But if a display is fast enough to handle the frame rate sent to it, there shouldn't be any skipping. A high quality 8ms LCD should display more than 60fps perfectly fine, with no skipping or tearing, if set up properly.
 
question, if i up the refresh rate will my computer have less like lagg when i run games with vsync. cus when i use vsync i get a little bit of lagg mouse and keyboard.
 
IMO it's better to turn vsync off. There was a CRT to LCD input lag comparrison somewhere that said using vsync took more time for and image to be displayed. And I've run 75htz on the 922 for over six months. You'll be fine. :)
 
Wait...what?

I thought the video card (with V-sync turned off) renders frames as fast as it can and sends that down the cable to the monitor, the monitor then draws whatever is see's on the cable which in the case of CRT's leads to tearing because the pixels are changed in order from the top row to the bottom row, this is fast but not instant and if the data being fed to the monitor changes during a refresh then you get an amalgamation of 2 or more frames on your screen

This kind of tearing isn't visible on a an LCD pannel because all the pixels change colour at the same time? (I've just assumed that not actually researched it, please correct me if I'm way out) This means essentially the monitor is taking a copy of whatever signal is on the cable at the time and reproducing that almost instantly on your screen. I'm assuming it has it's own buffer for this and grab a copy of all the available data for the current frame, as the pixels have their own response rate I it's still possible for the data for the current frame to change before the pixels are done changing colour.

Essentially it's like V-sync is always applied, only it's applied at the monitor end rather than at the video card end. Traditional CRT monitors need to cap the rate at which the frames are rendered at the video card and make sure that the video card frame buffer only swaps out the new frame when the monitor has finished drawing the previous frame and is moving the electron beam back to the top of the screen ready to draw the next frame.

I could be way off here but it's kind of what I've always assumed based on what i've read about the technology.
 
Ok I can't explain the whole vsync thing, but personally I play better with it OFF. This guy can explain it better.

"We will have the best reaction time with the Vsync option OFF as the card progressively sends the calculated information to the monitor. There is however one little delay (less than one image) for the display due to calculation times. Vsync OFF is the optimum solution. The problem is that it introduces ruptures in images. Aesthetically, it is less nice. Very often mostly with LCD, we activated the synchronisation of the card with the monitor. The monitor displays images only when they are fully calculated. It is nicer, but the framerate is reduced (we are restricted by the monitor refreshing rate, or 60 fps for 60 Hz like most of the monitors) and the delay increases. This time it is 2 whole images (on average)."

From this little write up
 
You must log in or register to reply here.
Back
Top