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A questions about LCD's and FPS

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ZTaylor

Registered
Joined
Feb 2, 2004
Location
St. Louis
I've been thinking about buying a LCD and have been reading alot about them.

From what I've been reading is this correct? If I have a 60FPS LCD like an L90D+, I have to cap my game (rtcw) to 60FPS with vsync on? The only way to be able to get higher FPS like 76 or 125 in the game I play I will have to turn vsync off?
Or, am I incorrect and can have my game set to any FPS I want and confussing MHZ with FPS?

Thanks for any help in clearing this up for me.
 
Last edited:

Kalivos

Member
Joined
May 31, 2005
Location
California
60FPS LCD? Perhaps you are talking about the maximum refresh rate you would be allowed to set on the monitor?
 

Burdman27911

Member
Joined
Oct 13, 2005
IIRC it's the same thing as a CRT. My old CRT that I used to use would go up to 85hz (85 times per second) at full rez. My Dell widescreen lcd does 75hz. With both you will only be able to see up to that many frames per second, but your computer isn't limited to only producing that amount. You could have a game running at 205fps but you would only see 85fps at most. Vsync will make it look better (because it will be synchronized), but afaik it has less effect with LCDs than CRTs.

I'm sure people will have more info than I will, but that should give you a general answer.
 

jediman

Member
Joined
Mar 11, 2003
you were not confusing anything
Hz just tells you how many times in a second and is at its core the same thing as FPS
your graphics cards puts however many frames it can "onto a table one at a time". The monitor displays the image that is on the top of the table however many times the refresh rate says it will (60hz mean it will display the picture 60 times in a second) the difference between an lcd and crt is that if it is the same image the lcd will not redraw it as none of the values for any pixels have changed. You will never display more than 60 frames per second at 60 hz, but some say its smoother if the card is putting more frames "onto the table" i run with vsync on as i get tearing if i don't have it
 

KillrBuckeye

Senior Member
Joined
Jan 9, 2005
Location
Livonia, MI
Burdman27911 said:
IIRC it's the same thing as a CRT. My old CRT that I used to use would go up to 85hz (85 times per second) at full rez. My Dell widescreen lcd does 75hz. With both you will only be able to see up to that many frames per second, but your computer isn't limited to only producing that amount. You could have a game running at 205fps but you would only see 85fps at most. Vsync will make it look better (because it will be synchronized), but afaik it has less effect with LCDs than CRTs.

I'm sure people will have more info than I will, but that should give you a general answer.
My understanding is that LCD monitors don't have a refresh rate limitation in the same sense as CRT monitors. If your computer is spitting out 120 FPS in a game while Vsync is disabled, then the LCD monitor will *attempt* to draw each frame on the screen. The problem is that the response rate of LCD monitors is not sufficient to accurately reproduce the colors in each frame at such a high frame rate. The individual pixels cannot change color fast enough, so the result is a "ghosting" or "smearing" effect on the screen, where clarity is lost.

For this reason, LCD manufacturers set a recommended "refresh rate", so that these effects are minimized. For an LCD monitor that comes with a "refresh rate" of 60 Hz (such as the Dell 2005FPW), the computer will only be outputting 60 frames per second in the Windows environment. In games, it is recommended that Vsync be enabled to limit the frame rate output to the Windows default--60 Hz in this case. At 60 Hz, each pixel should be able to accurately produce colors corresponding to each frame outputted by the computer.

So, to directly answer your questions:
No, you don't *HAVE* to cap your FPS using Vsync, but it is recommended that you do so, especially if you are sensitive to the motion blur issue described above. Some people are really bothered by "ghosting", while others don't seem to notice as much.

You can also cap your FPS in many games by using console commands or editing your config file. I notice you mention 76 and 125 FPS, so I assume you play games based on the Q3 engine. In such games, you can cap your FPS by typing "/set max_fps 76" in the console or in your config file. Rather than play with Vsync on, you may find that capping FPS at 76 is acceptable to you.

I hope this helps.
 

Burdman27911

Member
Joined
Oct 13, 2005
Thanks for clearing my post up KillrBuckeye, I wasn't quite sure I had it all correct as I'm new to the LCD arena.