Sapphire AMD HD6970 CF strange issue

[harkrom]

Hi there!

I'm new here, and with my first post i need you guys to help me with a wierd problem occurring to my two brand new sapphire hd6970 cards.

I filmed it, so i don't need to explain more: http://www.youtube.com/watch?v=S1DmwEHedtY


The first day i played some games there were no problems, even with CF enabled, but yesterday morning i got this strange screen tearing. For information, if i play games on windowed fullscreen all works fine.
I tried to run the cards separetly, without CF enabled with no problems nor tearing. So i suppose my cards are working fine!


I'm experiencing that issue only with CF enabled. I also tried to change cards slots without success.

Any ideas? I have 11.9 catalyst drivers installed, i use 1920x1200 screen resolution and my configuration is:


PC: Motherboard - Asus Rampage III Extreme ; CPU - Intel i7 930 D0 @ 4,2GHz Rock Solid Liquid cooled by Ybris ; VGA - 2x Sapphire Amd HD6970 Crossfire ; RAM - Corsair Dominator 6x2GB 1600Mhz 8-8-8-24 ; HDD - 3x WD VelociRaptor 150GB RAID0 & WD Caviar Green 1TB ; ALI - Corsair TW850HX ; CASE - CoolerMaster HAF932 ; Monitor - Samsung SyncMaster T240

 

[gmcizzle]

Does it only happen with this game or all games?

 

[harkrom]

All games i try to run!

 

[gmcizzle]

And those games are...?

 

[harkrom]

Dead island, Orcs must die, Warhammer 40.000 space marine, Starcraft 2, League of legends, Diablo 3 beta.

For now, these are the games i tested!

 

[harkrom]

Uh!

I tried now Rage. No problems with CF active.

Then I installed catalyst 11.10 beta 2, same problem with all the games i've listed, but Rage works flawlessly.

Damn, what a wierd thing.

 

[gmcizzle]

Heh, I guess it's a driver issue then. If you want to, try running the unigine heaven 2.5 benchmark (http://unigine.com/products/heaven/download/). That works great with CF, so if you have a problem in that then something is wrong.

 

[harkrom]

Mmmh, here 2 videos.

Fullscreen mode: http://www.youtube.com/watch?v=yOgswgSs4h0

Windowed mode: http://www.youtube.com/watch?v=9jgcAYsMS9w

 

[gmcizzle]

Wow that's strange...hmmm...maybe try other driver versions?

 

[harkrom]

I noticed that i get the screen tearing only while a game uses both VGAs, according to afterburner.

Games that use only one card work perfectly in fullscreen mode.

Windowed games use only one card, that's why i get no problems.

I guess them are not broken, because if tested singly all works good.

 

[gmcizzle]

Make sure your CF bridge is on tight and all that stuff. If you have another CF bridge lying around try that one instead.

 

[harkrom]

Same problem.

I changed the new CF bridge with the one i was using with my 2 HD5870.

Damn! I dont' know what else do..

 

[gmcizzle]

It might be the monitor, not the gfx cards. If you have Fraps or something try recording part of a game where it's doing that, and play the clip to see if it comes up in the video capture.

 

[harkrom]

Ok it's the monitor. I recorded unigine heaven benchmark in fullscreen and with CF enabled. No screen tearing.

Pff, so my monitor is fucked up? Maybe is the cable, because disabling CF all goes good.

 

[gmcizzle]

Maybe the DVI/HDMI cord is defective, try another if you can.

 

[harkrom]

Ok, i used an HDMI cable and now all works fine!

I assume that the DVI cable i was using is defective.

Thank you for the help, really really thank you.

 

[gmcizzle]

No problem, glad you got it working!