I did loads of research before I bought another GTX 780, and almost everywhere I read anything from, almost all people said you will see gains going SLI as long as nothing else is holding you back or limiting your system like your CPU. I have a 3570k overclocked to 4.2Ghz. It is my impression that Skyrim is well optimized for SLI.
I will state this. This is my first time going SLI. I do have SLI enabled through the Nvidia control panel and confirmed both GPUs are working with Precision X while in game. I still may have something wrong.
These framerates are from as soon as you enter Whiterun, and I have many mods that affect Whiterun as well as mods that ad NPCs.
(Framerates only changed 1-2fps if am running an ENB or not.)
Framerate without SLI = 20
Framerate with SLI = 18
I was hoping to see at least a small increase at this area, like 10-15 at least, but not a drop.
I have searched online on if there is any setting that you manually have to turn on to enable SLI in game, but everything I read is from 1 or 2 years ago, from like version 1.2 or 1.4 of Skyrim, and the things stated no longer apply, so I assumed it was implemented by default in the later updates.
Also, from monitoring them in game, my GPU usage maxes out around 50% and my CPU maxes out around 60%, not sure why so low even though my fps is so low.
Any advice is appreciated.