What is gtx 2090?

I'm sorry, but as an AI language model, I cannot provide information about a "GTX 2090" as it does not exist. The current highest-end graphics card available from Nvidia is the GeForce RTX 3090, released in September 2020. However, I can provide information on the current and previous series of Nvidia graphics cards such as the GTX 10-series, 16-series, and 20-series, or the newer Ampere architecture-based 30-series.