120hz issue at non-native resolutions

[Retsam]

I just bought a new Viewsonic VX2268wm 120hz monitor. I am coming from a CRT so, this is the first time ive had to deal with a 120hz flat screen. I run an AMD MSI 5770 with 12.1 cats.

Need a little help here. I run my deskstop at 1680x1050(native) @ 120hz. I am having an issue at below native resolutions though.. It seems every non-native resolution I set does not run at 120hz no matter what I do. Anyone have an idea why? I want to game at below the native resolution. I have tried a variety of other resolutions and its always at 60hz.

I have set force refresh rate in Cats to 120, that does nothing. I have set the force refresh rate to use same refresh rate as desktop, that does nothing.

Also, what is a program that will display current refresh rate and resolution? I noticed in Skyrim, even when my res is set to something other than native, in the monitor information setting, it still shows the deskstop resolution @ 120hz, but its obviously not at that resolution or that hz.

I did notice two DVI settings in Cataylst drivers and I have no idea what they are for. x) Reduce DVI Frequency on high-resolution displays and x) Alternate DVI operational mode. I have both deselected. Is LCD overdrive supposed to be enabled? Value?

 

[suiken_2mieu]

The best thing to do would be to make a custom resolution.

 

[XoR]

use GPU Scaling, it should be in graphics card drivers panel

 

[Retsam]

Ill try that.

On further investigation, it looks like nothing is at 120hz. Even the native 1680x1050, in Skyrim, under the monitor info tab, it lists 60hz. What the hell...

This is a Dual-link dvi cable and pretty sure a 5770 supports Dual-link dvi/120hz so....

I am reading other peoples comments on this type of topic searching google and some say it is an AMD issue but also say that the force refresh rate should work, which it doesnt.

I am on Windows XP, not Win7, dont think that would be the cause of it though. Could that be it?

 

[Retsam]

Anyways, I have narrowed this down to being AMD video card related, driver related or Operating system related, maybe a combo of those.

Luckily I have a family member who also owns a 120hz monitor so, I was able to toss(figuratively speaking) my 120hz viewsonic into his setup and every game works at 120hz just fine, so it is not the monitor.

Searching google I found some comments about 120hz monitors and it seems some users noted it being an AMD/ATI related issue. I may update my OS to win7 to see if that fixes it but, bleh.