View Full Version : CRT vs. LCD vs. frame rates

11-11-07, 03:52 PM
Back in the days of CRT monitors, the max fps would be equal to the refresh rate of the monitor. For example, a refresh rate of 100Hz would mean the max fps you could get in a game would be 100 fps. How come with LCD monitors you can get fps that are far higher than the refresh rate? The refresh rate on my bro's HP laptop is 60Hz be he gets upto 140 fps in CS:S. How is this?

11-11-07, 04:15 PM
The same thing happened with CRT monitors, nothing's changed. Maybe you remember having Vsync on, which does limit the max fps to the current refresh rate...

11-11-07, 04:44 PM
How is it possible to get an fps higher than the max refresh rate a monitor supports? Doesn't 100Hz mean the monitor is refreshed 100 times every second? If so and if that is the max the monitor supports, how can you get an fps higher than his number?

11-11-07, 06:19 PM
Just because the computer is putting out more frames per second doesn't mean that all of them are being shown. If the game was being calculated @ 120 FPS but your monitor only shows 60 FPS, technically, you would be seeing 1/2 the frames being calculated.

Like lfctony said, nothing has changed since the days of CRT monitors. It's always been like this as long as Vsync is disabled.

11-11-07, 09:21 PM
Having VSync enabled limits your frames to the max amount your monitor can put out. So far everything I see here is right. VSync is nice because it prevents tearing.... a situation when the FPS are so much faster than your monitors refresh rate that you can end up with two different frames on the same screen at the same time, thus causing a nice little horizontal line across the screen as the frames produced are not synchronized with your monitors refresh rate :p

11-11-07, 11:49 PM
How is it possible to get an fps higher than the max refresh rate a monitor supports?

Same way it's possible for a a display device to render faster than your eye can see.

I do see your point though and it is interesting in that if a display is locked at 60fsp, yet a game is reporting 120fps, then you are missng (not able to view) half the frames?

11-12-07, 12:26 AM
Basically, that's what causes tearing, ie frames on top of each other, half the screen updating etc. The video card outputs faster than what the monitor can display.