The RTX prefix is exclusively applied to cards that include Nvidia GPUs with specialized ray tracing hardware; otherwise, they utilize the same DirectX Raytracing API that Microsoft developed and that AMD's RDNA 2 GPUs employ. Real-time ray tracing is supported by these AMD GPUs, albeit at a greater performance cost than Nvidia's GPUs.
Intel's forthcoming Xe-HPG GPUs will be released early next year; they will also enable ray tracing utilizing Microsoft's DirectX Raytracing API. The Alchemist graphics cards will be the first to utilize them.