What types of applications may benefit from 2 Titan RTX vs 1 Titan RTX

Hello,

I am looking into using Titan RTX for deep learning for NLP, image analysis, and genomics applications. I was wondering what benefit, if any, may be provided from using 2 Titan RTX cards vs a single Titan RTX card. This is for a single desktop build to create prototypes using GPU acceleration for such applications. Please let me know. Thanks