Phoronix published a review on the 51 GPUs Tested, From The Radeon HD 2900XT To RX 580 & R9 Fury: Testing The 2017 Linux Driver Stack A quote from the article:

It's that time of the year where we see how the open-source AMD Linux graphics driver stack is working on past and present hardware in a large GPU comparison with various OpenGL games and workloads. This year we go from the new Radeon RX 580 all the way back to the Radeon HD 2900XT, looking at how the mature Radeon DRM kernel driver and R600 Gallium3D driver is working for aging ATI/AMD graphics hardware. In total there were 51 graphics cards tested for this comparison of Radeon cards as well as NVIDIA GeForce hardware for reference.

 51 GPUs Tested, From The Radeon HD 2900XT To RX 580 & R9 Fury: Testing The 2017 Linux Driver Stack @ Phoronix