Yea, pretty much. Honestly, GPU rendering is so standard these days you'd have a pretty hard time displaying anything on a screen without using one (normally, the GPU processor or the video card it's a part of, or the integrated GPU is the one driving actual display output through HDMI/DisplayPort/motherboard connection. Which speeds things up because the CPU never has to actually move framebuffers around* (except through manipulating GPU handles) since that's what the GPU is good at.

* Also often how modern DRM works, it just prevents the OS from reading back data on the GPU buffer for that application, so the GPU (and display output port) are the only things that actually see the data.