Need Help - 24" Viewsonic vx2433wm - Only 60hz?

Kid_Dynamite_ · 12 Dec 2009 at 12:04

Hi I have been told by some of my friends, that I should be capable of playing at 75Hz on this monitor, but mine wont seem to go above 60Hz in the ATI CCC.

I checked the manufacturer website and it is capable of more than 60hz, does anyone know how I can go above raising it?

My gfx card is 4870x2 using 9.6 Catalysts on Windows Vista - thanks for the help

ejr22 · 12 Dec 2009 at 12:35

I'm guessing, but you would probably need a Dual-Link DVI cable to run at anything over 60Hz. Like I say, a guess.

EDIT: It is no longer a guess, it is fact.

ejr22 · 12 Dec 2009 at 12:45

With a single DVI link, the largest resolution possible at 60 Hz is 2.75 megapixels (including blanking interval). For practical purposes, this allows a maximum screen resolution at 60 Hz of 1915 x 1436 pixels (standard 4:3 ratio), 1854 x 1483 pixels (5:4 ratio) or 2098 x 1311 (widescreen 8:5 ratio). The DVI connector therefore has provision for a second link, containing another set of red, green, and blue twisted pairs. When more bandwidth is required than is possible with a single link, the second link is enabled, and alternate pixels may be transmitted on each, allowing resolutions up to 4 megapixels at 60 Hz. The DVI specification mandates a fixed single link maximum pixel clock frequency of 165 MHz, where all display modes that require less than this must use single link mode, and all those that require more must switch to dual link mode. When both links are in use, the pixel rate on each may exceed 165 MHz. The second link can also be used when more than 24 bits per pixel is required, in which case it carries the least significant bits. The data pairs carry binary data at ten times the pixel clock reference frequency, for a maximum data rate of 1.65 Gbit/s x 3 data pairs for a single DVI link.

Kid_Dynamite_ · 12 Dec 2009 at 14:11

Erj22, thanks for the help mate - so If I was to buy one of those, do you have any idea what type of Hz I could set it at for the 1920x1080 (this is the resolution I use)

Blackbadger · 12 Dec 2009 at 15:05

I'm pretty sure the vx2433wm achieves it's 75hz by up-scaling/interpolation. In a similar manner to how say sony Bravia tv's claim 200hz etc.

The vx2433wm and a few similar are great screens with what I understand to be effectively a 120hz panel (limited to 75hz) but like the Bravia's they don't actually make any use of anything greater than a 60hz input.

a lot of us were looking into these before the 120hz samsungs/viewsonics were available, it was decided against due to the wizardry/interpolation.

I'd do some more research before investing in a cable. If I remember correctly it doesn't actually give you a true 75hz image.