Like iPhones and iPads, Apple Silicon Macs will use an Apple-designed GPU – which makes complete sense when you consider this is how current iOS devices work, but may be a pause for thought for some high-end users during the transition period.
Tile Based Deferred Rendering
You see, while Intel based Macs contain GPU’s from Intel, Nvidia and AMD, Apple Silicon Macs will use what the company seems fond of calling “Apple family” GPUs.
Refer Here for Original Post and Source https://www.computerworld.com/article/3564527/apple-has-built-its-own-mac-graphics-processors.html#tk.rss_all