Viewsonic VX2025WM Refresh rate.

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Slo Gun

Limp Gawd
Joined
Sep 10, 2005
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302
Hi.
Got mt Viewsonic vx2025wm today, its really nice, but the refresh rate seems to be stuck at 60hz.
I can force it to 75hz, but then the resolution decreases.

Is this monitor not designed to run at 1680x1050 at 75hz?

Thanks
 
From what I can recall no it is not. Most LCD's are not able to run refreshes that high at full resolution. But this should not matter since the refresh on an LCD is not the same as a CRT. The only customers I have ever seen that "have" to run a really high refresh are medical companies and military.
 
Why would you want to run higher than 60hz anyway? Higher than the native 60hz on most lcd's can cause problems and theres no reason that I can think of to go higher.
 
Thanks for the replies.

What kind of problems can 75hz cause?

On my old monitor i ran at 1280x1024 for years.
I use vysnc in games, so it enables my maximum frames to be 75, so if i use 60hz the max frames will be 60.....

Or does this not make a difference?
 
You can't run 75hz at the VX2025WM's native resolution when using the DVI connection - it exceeds the bandwidth limit for a single-link DVI connection. If you use the VGA connection you should be able to do 75hz at 1680x1050, but I don't recommend this since image fidelity is decreased when using VGA versus DVI.
 
I see. Thanks for the info.
So how about if i was to buy a dual link dvi cable? Would that work?
 
Why do you want more than 60hz refresh? Refresh rate is irrelevant for LCDs for all practical purposes. LCDs will not flicker regardless of refresh rate and update delay is governed by response time alone.
 
Slo Gun said:
I see. Thanks for the info.
So how about if i was to buy a dual link dvi cable? Would that work?
Click to expand...

No it wouldn't, or rather it wouldn't make a difference as the VX2025WM doesn't take advantage of a dual link connection on it's DVI port.
 
Overwind said:
Why do you want more than 60hz refresh? Refresh rate is irrelevant for LCDs for all practical purposes. LCDs will not flicker regardless of refresh rate and update delay is governed by response time alone.
Click to expand...


He's a gamer, and that makes the old "Refresh rate is irrelevant for LCDs" mantra very much untrue. The higher the refresh rate the higher the framerate when vsync is enabled. Disable vsync and you get mondo tearing.
 
I have tried vsync off, and i simply can't stand it....

Tried playing dark messiah.
Image tearing is something that really gets to me.
 
Slo Gun said:
I have tried vsync off, and i simply can't stand it....

Tried playing dark messiah.
Image tearing is something that really gets to me.
Click to expand...

Tearing sucks on my Acer 2051w too.
 
I now have 75hz refresh rate, forced it using a program called power strip.
The dual link cable was needed, other wise i would get a smal snowy effect...
 
Slo Gun said:
I now have 75hz refresh rate, forced it using a program called power strip.
The dual link cable was needed, other wise i would get a smal snowy effect...
Click to expand...

I don't think that's a good idea. It says right in the specs that 60Hz is max at 1680 x 1050.
 
Slo Gun said:
I have tried vsync off, and i simply can't stand it....

Tried playing dark messiah.
Image tearing is something that really gets to me.
Click to expand...

Yeah it really depends on the game you're playing.

Games with a lot of fast horizontal movement are really going to show tearing when vsync is disabled. I personally can't stand vsync disabled for most games, especially first person shooters.

The exception to that is racing games and RTS games like AOE3 or Titan Quest. Turning off vsync on those is awesome. :)
 
Varmint said:
I don't think that's a good idea. It says right in the specs that 60Hz is max at 1680 x 1050.
Click to expand...


Ive been trying to clear this up, because in the user guide it says 1680*1050 @ 75hz
its all very confusing......
 
Maybe it does support 75hz if you use a dual link DVI cable and if the monitor has the hardware to handle dual link DVI input, but I don't see how otherwise.

Single link DVI is capped at ~165mhz pixel clock, and 1680x1050 @ 75hz would be around 184mhz pixel clock which is way past the single link DVI spec.

FYI 1680x1050 @ 60hz is somewhere around 146mhz pixel clock.


I can take my VX2025WM up to around 68hz by using manual adjustments with a totally pristine picture, and that's right at a 165mhz pixel clock. Any higher and I get weird artifacting...
 
To say that there is no difference between 60 and 75 because it is an LCD that doesn't update that way, just isnt true. Try moving your window around fast with 60hz, and then set 75hz(lower resolution till you are allowed to) and you'll se that its much smoother with 75hz. I'd even go so far as to say that the difference is more important than the difference between 2ms and 16ms.

Try it for yourselves.
 
bushwakko said:
To say that there is no difference between 60 and 75 because it is an LCD that doesn't update that way, just isnt true. Try moving your window around fast with 60hz, and then set 75hz(lower resolution till you are allowed to) and you'll se that its much smoother with 75hz. I'd even go so far as to say that the difference is more important than the difference between 2ms and 16ms.

Try it for yourselves.
Click to expand...
I keep seeing people say this, but none of the LCD monitors I've used work that way.

On all of the LCD monitors I've used, setting a higher refresh rate causes it to be less smooth because it still only outputs 60 frames per second, so at 75 Hz, it skips every 5th frame, which causes motion to be jittery.

Perhaps some LCD monitors don't do this, but most do.

If your LCD monitor really does support 75 Hz properly, then yes, a higher refresh rate would be an advantage, but on most LCD monitors, it makes things worse.
 
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