I've several AMD/ATI GPUs that I got from various sources (old computers, main boards, etc).
I used them to add support for them in linux-libre.
Feel free to ask me to test something with linux-libre, Xorg or Wayland.

• RV350/M10 / RV360/M11 [Mobility Radeon 9600 (PRO) / 9700]:
  • driver : radeon
  • family : R300
  • location : Somewhere inside the Acer TravelMate 4000 mainboard
  • vendor_id:product_id : 1002:4e50
  • lspci : VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV350/M10 / RV360/M11 [Mobility Radeon 9600 (PRO) / 9700]
• RS880 [Radeon HD 4200]:
  • driver : radeon
  • family : R600
  • location : Inside the Asus M4A785T-M mainboard chipset
  • drmdb link : https://drmdb.emersion.fr/devices/a0a68e28377e
  • vendor_id:product_id : 1002:9710
  • lspci : VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RS880 [Radeon HD 4200]
• Wrestler [Radeon HD 6310]:
  • driver : radeon
  • family : Evergreen
  • location : Inside the Asrock E350M1 mainboard chipset
  • vendor_id:product_id : 1002:9802
  • lspci : VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Wrestler [Radeon HD 6310]
• Richland [Radeon HD 8650G]:
  • driver : radeon
  • family : Northern Islands
  • location : Somewhere inside the Lenovo G505s mainboard
  • drmdb link : https://drmdb.emersion.fr/devices/aa6832fbd630
  • vendor_id:product_id : 1002:990b
  • lspci : VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Richland [Radeon HD 8650G]
• Cape Verde PRO [Radeon HD 7750/8740 / R7 250E]:
  • driver : radeon
  • family : Southern Islands
  • location : On a PCIe card
  • drmdb link : https://drmdb.emersion.fr/devices/5e90a3d0d44b
  • vendor_id:product_id : 1002:002b
  • lspci : VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde PRO [Radeon HD 7750/8740 / R7 250E]