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Eyefinity screen tearing still prevalent with 7970

post #1 of 15
Thread Starter 
Even though it was supposed to have been fixed in like the 12.5 drivers, I'm still getting tearing on my 3rd monitor on the 13.1 drivers. I have 3x Dell U2412M monitors, 2x with display port adapters, and one just straight DVI.

I'm looking at 2 alternatives to possibly fixing the problem.

First, is a 4GB GTX 680, probably the Asus DCII one. Now, with that, I'll still be using mixed outputs on the card, 2x DVI, and the Display Port. So my question with that is, is the tearing just an AMD driver thing? Would using a GTX 680 have the same issue since it will still be mixed outputs? As well, I'm worried that while the card has more vRAM, it has a narrower bandwidth, 256-bit vs 384-bit. Am I getting too hung up on that fact? I don't think I really need 4GB for gaming at 5760x1200, but 2GB just seems like too little, so I'd rather have too much.

Second, is grabbing a Asus DCII 7970 from somewhere. Since that has 4x Display Ports, I could use all the same output to my 3 monitors, alleviating the problem all together. With that option though, after selling my reference 7970, I'd be spending $100 - $150 extra money on the same card, but with a fancier cooler and a higher clock speed. So I'm a little hesitant about that option as well.

Just looking for some advice on the topic, thanks smile.gif
post #2 of 15
Have you tried enabling vsync?
Does it do it on all games or just older ones?
You could also try capping the fps to your monitor refresh rate.

Tearing is where the card renders more than one frame per vertical refresh of your monitor(s) so you get the discontinuity. I don't think a different adapter would help.
 
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post #3 of 15
Quote:
Originally Posted by Simonzi View Post

Even though it was supposed to have been fixed in like the 12.5 drivers, I'm still getting tearing on my 3rd monitor on the 13.1 drivers. I have 3x Dell U2412M monitors, 2x with display port adapters, and one just straight DVI.

I'm looking at 2 alternatives to possibly fixing the problem.

First, is a 4GB GTX 680, probably the Asus DCII one. Now, with that, I'll still be using mixed outputs on the card, 2x DVI, and the Display Port. So my question with that is, is the tearing just an AMD driver thing? Would using a GTX 680 have the same issue since it will still be mixed outputs? As well, I'm worried that while the card has more vRAM, it has a narrower bandwidth, 256-bit vs 384-bit. Am I getting too hung up on that fact? I don't think I really need 4GB for gaming at 5760x1200, but 2GB just seems like too little, so I'd rather have too much.

Second, is grabbing a Asus DCII 7970 from somewhere. Since that has 4x Display Ports, I could use all the same output to my 3 monitors, alleviating the problem all together. With that option though, after selling my reference 7970, I'd be spending $100 - $150 extra money on the same card, but with a fancier cooler and a higher clock speed. So I'm a little hesitant about that option as well.

Just looking for some advice on the topic, thanks smile.gif


Tearing is not the fault of the 7970 itself what's happening is because display port and dvi have differant refresh rates, You are getting tearing, Even though the monitors are the same and all 60hz your still getting tearing because of the dp or dvi differantiation, The best solution would be to go out and buy a second 7970 with 3 display ports on it and put them in crossfire.
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post #4 of 15
Thread Starter 
I have tried enabling vsync, both in games and in CCC. The tearing isn't just in games, I can the vertical line even just dragging a web browser window around the monitor.

Looks like it's time to track down a Matrix or DCII 7970 then...
post #5 of 15
Try a different driver.
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post #6 of 15
Quote:
Originally Posted by Simonzi View Post

I have tried enabling vsync, both in games and in CCC. The tearing isn't just in games, I can the vertical line even just dragging a web browser window around the monitor.

Looks like it's time to track down a Matrix or DCII 7970 then...

yeah, thats odd, sorry I can't help you. All I can say is that I had pretty much the exact same configuration and had no tearing issues so it could be a problem with your card or monitors. I don't see why the timings would be different over display port vs dvi but I really don't know so would concede to anyone who does... it certainly would fit your problem though

My eyefinity setup was as follows with reference XFX 7970 Core editions:

DVI-D -> Monitor 1
HDMI->DVI-D (bundled passive adapter) -> Monitor 2
Mini DP -> DVI-D (Active adapter) -> Monitor 3

Just some further thoughts:

Were all your monitors purchased at the same time and therefore of identical spec?
If you disable eyefinity does the problem goes away and does bezel compensation affect it in any way?
You could try a different bios if you have the bios switch but it could just make things worse (http://www.techpowerup.com/vgabios/) - when I messed around with them it would often disable one of my outputs, restoring the original bios brought it back.
There is the 'official' ATI bios update to GHz edition clocks. Actually helped make my cards more stable (and faster!) - http://legitreviews.com/news/13622/
 
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post #7 of 15
I think they may have reverted the screen tearing fix. For myself and others on WSGF the fix would cause black bars to strobe up and down the primary monitor and any others that are synchronized with it with V-sync on. I haven't had the strobing since around 12.8 but the tearing on the single displayport monitor it back. It was also mentioned by a user on WSGF that this is not a problem on nvidia cards, but verify with surround users first.
 
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post #8 of 15
Still happens to me with 3 identical monitors, display port adapters, and cables. Cant fix this problem. Period.
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post #9 of 15
yep.. yet another reason not to bother with eyefinity! Nice of AMD to scream and shout about how it'll revolutionise your gaming experience but not bother to tell you the facts. They do admit it but you're unlikely to search for 'screen tearing eyefinity' unless you've experienced it 1st hand.

only solution is to have 3x display port monitors

read all about it here
http://support.amd.com/us/kbarticles/Pages/Screentearingwithmultipledisplays.aspx
 
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post #10 of 15
I just picked up the Sapphire 7870 XT (Tahiti architecture) a week ago, and while i love this card, the screen tearing on my left and right monitors is driving me nuts. What i think is funny is i was running a Sapphire 5770 for 3 years and not once did i experience screen tearing with the same DVI > DVI to HDMI > DVI to active display port setup. I think they are feeding us a load of crap. My 2 cents
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Bula's
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AMD PII x6 1055T ASUS M4A785TD-V EVO SAPPHIRE Radeon HD 5770 G.SKILL Ripjaws 4GB DDR3 1600 
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1 WD 74gb Raptor, 2 1tb WD green LG Blu-ray 10x Windows 7 x64 Ultimate Samsung bw226 
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Antec TPQ-850 850W Cooler Master HAF X 
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Overclock.net › Forums › Graphics Cards › AMD/ATI › Eyefinity screen tearing still prevalent with 7970