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Hd 6950 2gb crossfire eyefinity 3xDell U2711 max res issue

Last response: in Graphics & Displays
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August 26, 2011 2:50:36 PM

The Gear
Just put together a system with 3 Dell U2711 monitors and 2 Sapphire HD 6950 2Gb video cards in crossfire and I cannot get the maximum published resolution working.
Asus X58 chipset mainboard, i7 960 CPU, 12Gb DDR3 ram running Win7 64bit

The Issue
U2711 max resolution is 2650x1440, so Eyefinity should support 7680x1440, however best I am getting is 4800x1200.

Disabling Eyefinity gives me 2 monitors at max resolution of 2650x1400 and the other will only go to 1920x1080.

Troubleshooting tried so far
I am connecting 2 monitors with DVI-DL cables and 1 with displayport (U2711 has DP input).

I have tried swapping monitors and cables with spares - the issue doesn't stick with any one specific monitor so have ruled them out as creating the problem. Also doesn't seem to stick with any one DVI cable. However the prolem display always seems to be the one on the bottom DVI slot on the video card...though not sure if this is significant or not...?

I am using the latest ATI drivers - there are no drivers for the U2711 (wish there were though - Windows just reports it as a generic PNP monitor).

Would love to get his resolved as I have laid out quite a bit of cash on the setup and the 4800x1200 just looks really underwhelming :??: 

August 27, 2011 1:00:57 AM

thanks for the link - sounds very similar. I know eyefinity had an early issue where it was recommended you set up on 2, then 3 monitors.

Will try the progressive plugging in and detection by CCC to see if that works and update back.
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August 27, 2011 1:08:25 AM

no good. still the monitor plugged into the bottom DVI slot only has maximum available resolution of 1920x1080.

*sigh*

Going to try swapping the 6950s around - maybe if the one I am using now as primary (with all monitors plugged into) becomes the second crossfire GPU instead....
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August 27, 2011 7:03:08 AM

swapped the cards, but still only getting 4800x1200 in eyefinity in Windows. Interestingly Crysis2 gets up to 5760x1200. Just cant seem to bump up to the native res of the U2711 monitors...

Any ideas????
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August 27, 2011 7:59:13 AM

I think you best address this to the ATI site since you bought expensive cards and they should be able to provide more help and insight.
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Best solution

August 31, 2011 12:11:28 PM

Just found out the Sapphire HD 6950 2Gb Dirt3 edition has one DVI-DL and one DVI-SL. The issue was the DVI-SL is limited to 1920x1200 thus preventing the monitor going to 2560x1440 (DVI specs at wikipedia).

Traded them in for two Sapphire HD 6970 2Gb cards with two mini-DP and one DVI-DL port - all good now! :bounce: 

Now if I could only select my post as best answer....
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August 31, 2011 4:23:26 PM

Mine, of course :) 
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a b C Monitor
February 2, 2012 10:27:45 PM

This topic has been closed by Mousemonkey
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a b C Monitor
February 2, 2012 10:28:31 PM

Best answer selected by mousemonkey.
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