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Nvidia Surround users, please check ....

post #1 of 10
Thread Starter 
If you have a Surround setup in SLI please try moving the monitor locations in the "Span displays with Surround" and run a benchmark like Heaven or 3Dmark11 at 1080p to see if there is any difference.

I have 3x 120Hz monitors connected to 2x gtx680 4GB cards. I made some changes to my display configuration and found that performance was impacted depending on the configuration. I'm just curious if anyone else sees this.

I have two monitors connected to the gpu2(lower) and the third connected to gpu 1.



Assigning the monitors left to right 1 2 3, I see the following result:



Assigning the monitors left to right 1 3 2, I see the following result:



Assigning the monitors left to right 3 1 2, I see the following result:



Why is there such a difference depending on the display configuration? The results of 3Dmark11 scale in the same way. All I'm doing is changing the order of the displays in the "Span displays with Surround" configuration.

I'm using the 304.79 drivers. I've verified that both cards are running at PCIE 2.0 x8, but this seems to be fine. This is on a Asus Maximus III Formula with an i7-860 at 3.8GHz.

Thanks,
Steve
post #2 of 10
Please confirm this someone- but like i said in my last post- its the way your cpu divides up the tasks to tell the gpus what to do. It has to be sequential for the way the code is written to be optimised. If you can imagine a grid that starts out at (x,y) in the bottom left origin 0,0 and extends to however big your display resolution is, your cpus schedule the task of 3 monitors by dividing that whole image into 3 pieces. It has to compute that image along the x axis for every pixel and if your not going in sequence with your monitors your cpu has to add an instruction to exclude the middle part until after the third part has been compute which causes you to see lower scores
   
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post #3 of 10
It's better to have two monitors on GPU1... having said that, in the early days, that was the only way it worked...

Remnant's explanation sounds reasonable.
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post #4 of 10
Thread Starter 
Remnant88888888, you must be right. I just have a hard time believing the performance differences. I haven't seen anything from Nvidia indicating that the DVI connections need to be made in sequence with the Surround position assignments.

As long as the lowest physical DVI connector is the left monitor, the next one up is the middle monitor and the third one up is the right monitor the performance is fine. Any other combination has significantly lower performance.

The problem I have is that there are only 2 ways I can connect and configure the monitors for best performance, but there are 24 ways to connect 3 monitors to the 4 available DVI ports. If I follow the Nvidia documentation, then I have a 1/12 chance of getting the best performance.
post #5 of 10
i'm just about to go ahead soon with setting up my surround...wondering which configuration of DVI connections will yield best results

GPU1: DVI-D center monitor, DVI-I right monitor
GPU2: DVI-D left monitor

Does that look right?

Originally I was going to use GPU1 DVI-D center, GPU2 DVI-D left and DVI-I right since I only use surround when I play games...all other tasks I use primarly the center screen
     
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post #6 of 10
Quote:
Originally Posted by twitchyzero View Post

i'm just about to go ahead soon with setting up my surround...wondering which configuration of DVI connections will yield best results
GPU1: DVI-D center monitor, DVI-I right monitor
GPU2: DVI-D left monitor
Does that look right?
That's pretty much the way nVidia recommend. Although the setup wizard will walk you through how monitors should be connected. smile.gif
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post #7 of 10
I'm about to buy cables right now as I no longer wish to go triple DVI route anymore..

Which one will run into less issues?

my monitor only has DVI and DP

right display => DP => GPU1
center display => DVI to HDMI => GPU1
left display => DP => GPU2

OR

right display => DP => GPU1
center display => DVI => GPU1
left display => DP => GPU2

According to NVIDIA they'll both work..but would like to know if there's one that may be better than the other in terms of less issues.

http://www.nvidia.com/content/3d-vision/images/system-requirements/3DVision_Surround_GF_GTX_670_Apr12_2way.pdf
     
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post #8 of 10
Quote:
Originally Posted by twitchyzero View Post

I'm about to buy cables right now as I no longer wish to go triple DVI route anymore..
Which one will run into less issues?
my monitor only has DVI and DP
right display => DP => GPU1
center display => DVI to HDMI => GPU1
left display => DP => GPU2
OR
right display => DP => GPU1
center display => DVI => GPU1
left display => DP => GPU2
According to NVIDIA they'll both work..but would like to know if there's one that may be better than the other in terms of less issues.
http://www.nvidia.com/content/3d-vision/images/system-requirements/3DVision_Surround_GF_GTX_670_Apr12_2way.pdf

I would like to know this too. I dropped 100$ on a displayport adapter thinking that I had to run all the monitors from GPU1 just like how SLI works but if I can do it this way then I could have saved 100$. Also I plan on using 3d surround so I don't know if that is any consolation but damn.. i should have done my research
post #9 of 10
In terms of issues experienced, they'll likely be about equal. Surround still has some quirks (although nVidia do at last seem to be taking them seriously) but I'd say that any of the setups officially listed by nVidia should be mostly problem free.
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post #10 of 10
Kind of a late post:
For aesthetic preferences though how do I get the Windows logo screen back to the middle screen then. It always shows up on monitor 1 for me.
and if you identify monitors it should read left to right monitor 1, 2, 3?
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