[saltines17]

G4 Sawtooth: 450MHz G4, 2x AGP, Radeon 8500 64 MB, 1.12 GB RAM, OS X.2.1, OS X.2.0, OS 9.2.2.

Is there any possible reason why my Viewsonic VX900 19" LCD would refresh at a ridiculously slower rate than both my older 15" NEC LCD and Apple's 15" LCD?

I tested this in the following configurations, all under both OS X.2.1, OS X.2.0, and OS 9.2.2:

1) Radeon 8500 single display - VX900 DVI
2) Radeon 8500 single display - VX900 VGA
3) Radeon 8500 single display - NEC VGA
4) Radeon 8500 dual display (Mirroring) - VX900(DVI) + NEC (VGA)
5) Radeon 8500 single display - VX900 DVI + PCI Rage 128 - NEC VGA
6) AGP Rage 128 Pro single display - VX900 DVI

It think you get the idea... basically, it's not the card... and I find it hard to believe that this new model LCD could ghost so much...
Before I go return this... does anyone have any clue what might be going wrong???

thanks...

[tooki]

On VGA, try lowering the refresh rate to 60Hz. LCD flat panels do not refresh in the same way as a CRT (or even plasma display). What they do when using VGA is to resample and convert the image back to digital. It's easier for the display controller to do this at lower refresh rates, so you get a better image at 60Hz than at, say, 75Hz. Of course, after changing the refresh rate, be sure to run the automatic calibration again.

Now, on DVI, you should be getting a crystal clear image with no adjustments (and refresh rates should not be available at all).

At the risk of sounding condescending, are you sure that you are driving that display at its native resolution of 1280x1024? If you're not, you absolutely will not get a crisp image.

Also, I'm moving this to peripherals, since it's not a Power Mac-specific question.

tooki

[saltines17]

Originally posted by tooki:


Now, on DVI, you should be getting a crystal clear image with no adjustments (and refresh rates should not be available at all).

At the risk of sounding condescending, are you sure that you are driving that display at its native resolution of 1280x1024? If you're not, you absolutely will not get a crisp image.

The issue isn't with the image; it's with the blurred motion of moving things onscreen. Also, there are two choices for refresh (on DVI): 60Hz and 75Hz. That IS pretty odd, isn't it... but it's definitely connected to the DVI port on the Radeon. And yes, it is (and by default, if I may add) on 1280x1024; i also tried all the other choices, still same problem.

[passmaster16]

Originally posted by saltines17:


The issue isn't with the image; it's with the blurred motion of moving things onscreen. Also, there are two choices for refresh (on DVI): 60Hz and 75Hz. That IS pretty odd, isn't it... but it's definitely connected to the DVI port on the Radeon. And yes, it is (and by default, if I may add) on 1280x1024; i also tried all the other choices, still same problem.

Well, from what I hear, sometimes LCDs have a difficult time keeping up with motion because they can't refresh fast enough. Although I don't think that it should be as noticable as you explain it to be. And as tooki said, you really shouldn't have a choice of refresh rates when connected via dvi. very odd.

[saltines17]

Yeah I know LCD's aren't quite as fast as CRT's and such, but I'm comparing strictly LCD to LCD.