120HZ Eyefinity, slightly different question

[Arkayn]

Hi everyone,

I think my issue is slightly different to what I can find on here and google.

I have xfire 7970's (Gigabyte reference) and 3 Samsung S27A950D monitors. These monitors support DP, DVI-D and HDMI.

When I do a Eyefinity setup of 5760x1080 I can only select 60 hz in Windows and Catalyst control panel.

IF I run 1 monitor at a time I can select 120hz on the two connected by DP but only 60hz on the DVI-D (windows and CCC).

The cable is 100% DVI-D. I have installed the monitor drivers too.

Do I need an DVI to DP adapter so that all 3 monitors are connected by DP to get 120hz Eyefinity?

Does the adapter need to be ACTIVE?

I ask cause everything I find says I can do 120hz with DVI-D or DP but it won't work for me hence I may have another issue. All driver versions from 14.4beta all the way through the 13's has this issue. The other thing that throws me is nVidia works with DVI-D for 120hz multiscreen.

So in short do I need to run different to 2x DP and 1x DVI-D to get 120hz?

[Haldi]

You don't need a DVI-D you'd need a DVI-DL
The D stands for Digital, the DL for Dual Link! If you wan't enough bandwidth for 120hz on 1920x1080 you will need a Dual Link cable and a capable Dual Link DVI port. And you Monitor needs to be able to use Dual Link DVI input.

[Arkayn]

You don't need a DVI-D you'd need a DVI-DL
The D stands for Digital, the DL for Dual Link! If you wan't enough bandwidth for 120hz on 1920x1080 you will need a Dual Link cable and a capable Dual Link DVI port. And you Monitor needs to be able to use Dual Link DVI input.

Sorry I do have a DVI_DL cable - the one with 24 pins so no gab in the middle.

So if I have the right cable does anyone have any idea why I cannot get 120hz on the dvi connected monitor?

The card is a Radeon GV-R797OC-3GD.

[Arkayn]

You don't need a DVI-D you'd need a DVI-DL
The D stands for Digital, the DL for Dual Link! If you wan't enough bandwidth for 120hz on 1920x1080 you will need a Dual Link cable and a capable Dual Link DVI port. And you Monitor needs to be able to use Dual Link DVI input.

Cable is a dual link. Saw a post elsewhere of someone having to de then re-attached the cable with the PC on and vola, 120hz.
Did the same and it worked for me too both in windows display settings and CCC. AMD strikes again...

[Haldi]

how easy to solve and completly unlogical some problems can be.

Have fun playing

[Arkayn]

how easy to solve and completly unlogical some problems can be.

Have fun playing

Turns out it does not stick after a reboot of the PC.
I sent AMD a support ticket but the speed they fix all the other known crossfire issues and the fact the forums for AMD are filled with no replies complaints I aint holding my breath.

No ideas anyone else?