Hello,
 
I was wondering if anyone here has recent NVIDIA GPU's, e.g. Kepler and run these in SLI with multiple monitors? I need to do some more testing when I have the time, but so far it seems that Xorg is unable to use multiple monitors when I have SLI enabled.
 
I do not use Xinerama or Twinview, but I have two different working multi-monitor setups and both of them only uses the main monitor when I enable SLI. One of my setups involve Xrandr and having all the monitors working together as one big desktop, then the other solution involves different screen's where each monitor will have it's very own desktop.
 
Thank you.

The newest Nvidia GPUs i can say this works on are the 500 series.  I could get 2 monitors and SLI working.  However.  It did take some work.  And off the top of my head.  I cant remember what i did.  For me it worked in all modes.  Even was able to span across multiple monitors(Not identical).  But sadly i have no way to test the 600 series with those settings.

Later today i will check again.  To be honest i have been in windows alot lately and have not had SLI on while in ubuntu.  I do remember it would only work right if i had it set to SFR.  

I realized i had not tested this with 13.04. Testing there, sadly i got the same results.  Except one time.  Where i got both monitors.  But neither was usable(Where the mouse was, and where i clicked always failed to match+distorted)  This was with my old 12.04 xorg.conf.   Making a new one and starting over.  The best i could get was SLI on, and one usable monitor(other one asleep).  If i get more time.  I will play with it again.  But it appears to be an issue within unity or within the drivers. :(.  Judging by the same results in linux mint.  I would have to guess its the drivers.

My SLI setup was a success. I had 3 monitors in Surround with one GTX 670 before I started. When I got done with SLI I could only run one. But I went into windows control panel and NVidia surround setup and was able to get two working. Then I configured the 3rd monitor in windows display settings. When I click surround it still goes to one. but when I click optimize for 3D  I can use 3 monitors. Just not the surround version where you can get one background to stretch the span of 3 monitors. Hope this helps! I will continue to try the surround setup and report back. Thanks,
 
Bret :0)

It kind of sounds like you did this in Windows, btodd1? Our problem is getting this to work in Linux (Gentoo in my case). We are in the Linux section of EVGA's forums as well.

No worries, Bret.
 
At least now we know and can only hope this get's fixed by Nvidia if it indeed a driver issue.