After settting up three monitors for CLoD, I discovered that my computer needed the boost of an additional graphics card. So I bought a second, identical card only to discover that while it worked well with the three screen view, the SLI feature was not making any impact when on a single screen. I still found it necessary to reduce some of the in-game graphics settings when flying in those missions with lots of clouds or cityscapes, especially the Carpiquet-Crepon scenario.
After a long search, I have discovered a simple way to implement two-card SLI on one NVidia Surround screen , resulting in an enormous increase in framerate and visual smoothness. Please note that I can only address the vast improvement I have seen on my system with 2x GTX 780's. While I see no reason for it not to work for everyone using SLI, I can't guaranty that it will. [UPDATE... apparantly it does! See next two replies to this thread.]
Our objective is to make the computer alternate between the two GPUs when drawing the screen using "Alternate Frame Rendering method two". The following instructions assume that you have SLI set up with multi-screen Nvidia 2D Surround and that SLI shows "Enabled" in the Nvidia control panel. I have no way to tell whether or not it works on Non Surround single monitor SLI setups.
Verify or load NVidia Driver 344.11 or later.
Download Free NVIDIA Inspector 1.9.7.2 or later at your favorite site or:
http://www.softpedia.com/get/System/...nspector.shtml
Open it and click on the "Driver Version" tools icon, halfway down on the right.
This opens a "Profile Settings" screen revealing a plethora of settings for your graphics card. About halfway down is the section entitled "SLI". Select the following three options:
"Number of GPUs to use on SLI rendering mode" SLI_GPU_COUNT_TWO
"NVIDIA predefined numberof GPUs to use on SLI rendering mode" SLI_PREDEFINED_GPU_COUNT_TWO
"SLI rendering mode" SLI_RENDERING_MODE_FORCE_AFR2
Apply the changes by clicking the button at the upper right of the screen. Close the Profile Settings and the Nvidia Inspector.
Right click the desktop to select your NV Surround screen resolution for a single screen. Mine is 2560 x 1600, the native resolution.
Run Cliffs of Dover, select OPTIONS/VIDEO and set the same resolution you just selected from the desktop. Select "VERY HIGH", and deselect VSYNC per NVIDIA SLI recommendations to release the framerate. UPDATE: Some of us find in-game Vsynch to be very effective. You'll have to restart the application. When you come back in to the game, remember to run any quick mission for a few seconds to eliminate the green particles (smoke & dust) issue associated with SLI.
Enter the server and play the game. Let us know how things worked with your computer configuration in this thread.
UPDATE 09/13/2016: After the Windows 10 and GTX 980ti Video cards were installed, I found it necessary to change from AFR2 to AFR (AFR1, I guess), to prevent some weird shearing and such. My advice is for all to experiment to find out which AFR is best for your setup after you finally get the SLI working.
Nvidia Inspector is no longer necessary since AFR and AFR2 are now available in the 3D settings of the Nvidia control panel.
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