The Enhanced Graphics Pack requires 8GB of VRAM minimum for 1080p. For 4K resolution, you need 11GB+ (RTX 2080 Ti or better).

Why is a paid or exclusive DLC for graphics useful rather than a free patch?

In this article, we break down what this alleged "exclusive" DLC actually is, whether it exists, how to get it, and—most importantly—if it gives you a competitive edge or just melts your GPU.

Installing the pack adds approximately to the game's file size. Enhanced Graphics Pack on Steam

The for Age of Empires II: Definitive Edition