SGI GMD-20E21 Monitor hardware issue

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Marepioggia
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Location: Torino, Italy
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SGI GMD-20E21 Monitor hardware issue

Unread postby Marepioggia » Fri Jul 20, 2012 4:50 am

My first post on these boards so hello everyone from Italy.

I've been owning this rebranded Sony Trinitron monitor since last year and despite weighing 2 tons it's really a pretty good screen (I got it for like 30 Euros, too and it was in pristine conditions at the time).

Last month I got a new computer and hooked it up to the monitor through a DVI to VGA adapter; up until then it had been working at 1600x1200 100Hz on my old and obsolete machine (Windows XP, Pentium 4 something-or-other, Radeon X-800 GT, 1 Gb of RAM) without problems (I just had to center the picture through the monitor settings thing), now it flat out refuse to go past (as in, showing any picture at all) 1600x1200 72Hz.

My new computer has the following configuration: Windows 7 Home Premium SP1, i5 2500k, GeForce GTX 560 Ti, 8 Gb of RAM.

Is there a way to unlock the monitor 100 Hz (or higher) mode on my new PC (I've been reading about it, looks like it's an issue with Windows 7 or something)?
Is my monitor even capable of displaying that kinda resolution (or any resolution for that matter) at 100 Hz or higher or was that just XP making stuff up (as in, it stated that it was working at 100 Hz but that wasn't the case)? The specs:

20" 1900x1200 30-96 KHz. (Horizontal) 48-160 Hz. (Vertical) Multi Yes 13W3, HD15


Thanks in advance for your precious help on this issue.

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canavan
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Re: SGI GMD-20E21 Monitor hardware issue

Unread postby canavan » Sat Jul 21, 2012 6:58 am

According to the VESA GTF, 1600x1200@100Hz needas a horizontal frequency of 127kHz. That's way outside the limit (96kHz) of your monitor.

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Marepioggia
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Re: SGI GMD-20E21 Monitor hardware issue

Unread postby Marepioggia » Sat Jul 21, 2012 12:15 pm

what does it say for lower res? I'd be content with 800x600 @100 Hz or something.

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canavan
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Re: SGI GMD-20E21 Monitor hardware issue

Unread postby canavan » Sun Jul 22, 2012 7:01 am

Try it yourself: http://www.cs.unc.edu/Research/stc/FAQs/Video/GTF_V1R1.xls As a rule of thumb, you can assume that ( Vertical Resolution + 20% ) * Refresh Rate is roughly the horizontal scan rate. So if you really want 100HZ, you may get away with 1152x864.


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