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Loosing the ability to use 120hz LCDs in Eyefinity group
http://www.wsgf.org/phpBB3/viewtopic.php?f=66&t=18767		 Page 1 of 1
Author:  voigt [ 27 Dec 2009, 22:03 ]
Post subject:  Loosing the ability to use 120hz LCDs in Eyefinity group
I am running 3 Viewsonic VX2265wm monitors that support the new 1680x1050@120hz refresh rate. When in extended desktop mode I can configure all 3 to 120hz but when I group them with Eyefinity my refresh rate choice drops down to 60hz only. Is this a driver limitation or can the Eyefinity hardware not output at 120hz?

Any input would be appreciated, I really want Eyefinity to be a success and hope these things can be fixed in time.
Author:  Sideeffect [ 27 Dec 2009, 22:11 ]
Post subject:  Re: Loosing the ability to use 120hz LCDs in Eyefinity group
The only way around it at the moment is to use a modified EDID as detailed in this thread http://www.widescreengamingforum.com/forum/viewtopic.php?f=64&t=17635.
Author:  voigt [ 27 Dec 2009, 22:49 ]
Post subject:  Re: Loosing the ability to use 120hz LCDs in Eyefinity group
The only way around it at the moment is to use a modified EDID as detailed in this thread http://www.widescreengamingforum.com/forum/viewtopic.php?f=64&t=17635.


But the EDID being detected by CCC shows it supports 120hz already, how would modifying it help?

EDID detects 120hz
Single Display set at 120hz
Eyefinity group stuck at 60hz

I can set each display to 120hz outside of the Eyefinity group but once grouped they all turn back to 60hz and the menu has no other option.
Author:  voigt [ 28 Dec 2009, 02:00 ]
Post subject:  Re: Loosing the ability to use 120hz LCDs in Eyefinity group
I found this snip of information browsing other forums.

well, im going by amd's display port, only uses the equivalent of a single lane of their 6 outputs... ie dvi-i only on the 5000 series.

dp takes 1 of 6, hdmi takes 1 of 6, dvi-d takes 2 of 6, so 2 dvi and a hdmi port on a card is 5 of 6 used, means thats all your 6 eyefinity gone


If this is true and the DisplayPort on the 5870 is only a single link this might explain why it cant run at 120hz, Is this something software can fix. I am not using the hdmi connection on the card at all.
Author:  Sideeffect [ 28 Dec 2009, 03:14 ]
Post subject:  Re: Loosing the ability to use 120hz LCDs in Eyefinity group
[quote]The only way around it at the moment is to use a modified EDID as detailed in this thread http://www.widescreengamingforum.com/forum/viewtopic.php?f=64&t=17635.


But the EDID being detected by CCC shows it supports 120hz already, how would modifying it help?

EDID detects 120hz
Single Display set at 120hz
Eyefinity group stuck at 60hz

I can set each display to 120hz outside of the Eyefinity group but once grouped they all turn back to 60hz and the menu has no other option.

Because you need to allow only 1 choice in the EDID for the eyefiity group to force custom refresh rates. Read the thread it explains it.
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