Should I SLI for Editing?

Solution
Premiere CS6 does not support SLI (may lock out some options), DaVinci doesn't support it, and After Effects supports it, but your performance may drop when using it.

It's not worth it, if you really want an upgrade, look for better CPUs in your socket or upgrade your MOBO and CPU.
For video editing? If your application supports SLI, that would be fine, or you could upgrade that 960. But most of your performance when editing videos is toward the CPU-side, as that'll impact most of it.
 
SLI is and has always been very inefficient. You should sell your current GPU and upgrade to a newer model, rather then try to SLI 2 GPUs. SLI has many compatibility issues and sometimes doesn't work whatsoever. If you can, you could upgrade a GeForce 10 card, or wait until AMD releases their cards.

Also, what editing software?
 




I use Premiere CS6, Da Vinci Resolve 12.5, After Effects
 
I can't find much online about SLI for that particular software. It's much less risky to buy a single GPU and be sure it will run faster then spend on a second 960 only to find out it was pointless.
 
Premiere CS6 does not support SLI (may lock out some options), DaVinci doesn't support it, and After Effects supports it, but your performance may drop when using it.

It's not worth it, if you really want an upgrade, look for better CPUs in your socket or upgrade your MOBO and CPU.
 
Solution