The other advantage the RTX 2080 has over the GTX 1080 Ti is Deep Learning Super Sampling (DLSS) thanks to the GPU's tensor cores which bring machine learning to consumer graphics cards. Theoretically, the GTX line of GPUs can perform real-time ray tracing-they just can't do it and maintain anything resembling a playable framerate. The RTX cards utilize both traditional rasterization and real-time ray tracing to achieve lighting effects in games that simply aren't possible on the GTX 1080 Ti, since it lacks the dedicated hardware required to make ray tracing possible. The RTX 2080 has dedicated RT and tensor cores that allows the card to render real-time ray tracing in games. Here's a demo of ray tracing in Metro: Exodus which will help you understand how it works and what it means for gaming:
Ray tracing essentially mimics the way actual rays of light work, making it far more realistic and visually stunning. Nvidia has been touting the benefits of ray tracing in games ever since the RTX line debuted, and it is impressive. Ray tracing is where you really start to notice the difference between the GTX 1080 Ti and the RTX 2080. With 4K HDR monitors still astronomically expensive, however, this is likely not a huge factor. While HDR isn't a huge factor for most gamers, if you are planning to game in 4K with HDR, the RTX 2080 outperforms the GTX 1080 Ti across the board. And while both cards offer similar performance benchmarks, the RTX 2080 offers a boost at higher resolutions, handily beating the GTX 1080 Ti in 4K gaming. The RTX 2080 utilizes faster GDDR6 memory, for one thing. Both the RTX 2080 and the GTX 1080 Ti are extremely fast, but there are some differences worth noting.
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