980ti SLI is faster than any single card solution. The ONLY reason to consider what you're suggesting is if you're having specific SLI issues with specific games you value. If you're not then scratch that daft upgrade itch with something else 
The GPU scene has gone a bit dull again at the mo. It's amd's fault for not providing valid competition.

The GPU scene has gone a bit dull again at the mo. It's amd's fault for not providing valid competition.