Second Monitor on RADEON 9800 Pro Has Lower Sync Rate

[Guest]

Archived from groups: alt.comp.periphs.videocards.ati (More info?)

I have two Viewsonic P817 monitors attached to a RADEON 9800 Pro, each
running 2048x1536 desktops under Windows 2000. I'm finding that the P817
attached to the 15-pin analog port can run at 85 Hz, whereas the P817
attached to the digital video port can only do 75 Hz. As soon as I try 85
Hz on the monitor attached to digital video, it not only fails to sync, but
gets a red status light that can only be cleared by rebooting.

Is there a known limitation that prevents the digital video port from
syncing at the same speeds as the 15-pin analog port?

--
Will
westes AT earthbroadcast.com

 

[chip]

Archived from groups: alt.comp.periphs.videocards.ati (More info?)

"CHANGE USERNAME TO westes" <DELETE_westes@earthbroadcast.com> wrote in
message news:-cidnRBhIZGTMebdRVn-iQ@giganews.com...
> I have two Viewsonic P817 monitors attached to a RADEON 9800 Pro, each
> running 2048x1536 desktops under Windows 2000. I'm finding that the
P817
> attached to the 15-pin analog port can run at 85 Hz, whereas the P817
> attached to the digital video port can only do 75 Hz. As soon as I try
85
> Hz on the monitor attached to digital video, it not only fails to sync,
but
> gets a red status light that can only be cleared by rebooting.
>
> Is there a known limitation that prevents the digital video port from
> syncing at the same speeds as the 15-pin analog port?

Have you checked that your monitor can support this rate via the DVI port?
Many monitors won't support DVI refresh rates quite as high as they do on
analogue. Don't ask me why, it seems stupid to me, but there you go.

Chip


>
> --
> Will
> westes AT earthbroadcast.com
>
>

 

[Andrew]

Archived from groups: alt.comp.periphs.videocards.ati (More info?)

On Tue, 13 Apr 2004 15:43:13 +0100, "Chip" <anneonymouse@virgin.net>
wrote:

>Have you checked that your monitor can support this rate via the DVI port?
>Many monitors won't support DVI refresh rates quite as high as they do on
>analogue. Don't ask me why, it seems stupid to me, but there you go.

Because refresh rates don't work in the same way on TFT screens as CRT
and don't need to be as high.
--
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Help make Usenet a better place: English is read downwards,
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[chip]

Archived from groups: alt.comp.periphs.videocards.ati (More info?)

"Andrew" <spamtrap@localhost> wrote in message
news:h3vn70hevmobu0m0gupnlbal56ii60nl69@4ax.com...
> On Tue, 13 Apr 2004 15:43:13 +0100, "Chip" <anneonymouse@virgin.net>
> wrote:
>
> >Have you checked that your monitor can support this rate via the DVI
port?
> >Many monitors won't support DVI refresh rates quite as high as they do on
> >analogue. Don't ask me why, it seems stupid to me, but there you go.
>
> Because refresh rates don't work in the same way on TFT screens as CRT
> and don't need to be as high.

Sorry, but I think you misunderstood my question. Let me paraphrase it:

"I don't understand why some TFT screens support higher refresh rates via
their analogue ports than they do through their DVI ports".

Chip


> --
> Andrew. To email unscramble nrc@gurjevgrzrboivbhf.pbz & remove spamtrap.
> Help make Usenet a better place: English is read downwards,
> please don't top post. Trim messages to quote only relevent text.
> Check groups.google.com before asking a question.