Ubuntu 15.04 Tonga AMDGPU vs. Catalyst
Benchmarks by Michael Larabel of Phoronix.com. Linux 4.2 lacks AMDGPU power management for the Radeon R9 285 TONGA.


Catalyst 15.7: 

	Processor: Intel Core i7-5960X @ 3.50GHz (16 Cores), Motherboard: Gigabyte X99-UD4-CF, Chipset: Intel Xeon E5 v3/Core, Memory: 16384MB, Disk: 120GB SPCC Solid State, Graphics: Supported device 6939 2048MB (918/1375MHz), Audio: Intel C610/X99, Monitor: SyncMaster, Network: Intel Connection

	OS: Ubuntu 15.04, Kernel: 3.19.0-23-generic (x86_64), Desktop: Unity 7.3.2, Display Server: X Server 1.17.1, Display Driver: fglrx 15.20.3, OpenGL: 4.4.13397, Compiler: GCC 4.9.2, File-System: ext4, Screen Resolution: 2560x1600

Mesa git-2c8fd42 AMDGPU + LLVM 3.8 SVN: 

	Processor: Intel Core i7-5960X @ 3.50GHz (16 Cores), Motherboard: Gigabyte X99-UD4-CF, Chipset: Intel Xeon E5 v3/Core, Memory: 16384MB, Disk: 120GB SPCC Solid State, Graphics: XFX AMD Radeon R9 285 2048MB, Audio: Realtek ALC1150, Monitor: SyncMaster, Network: Intel Connection

	OS: Ubuntu 15.04, Kernel: 4.2.0-999-generic (x86_64) 20150723, Desktop: Unity 7.3.2, Display Server: X Server 1.17.1, Display Driver: radeon 7.5.0, OpenGL: 3.3 Mesa 10.7.0-devel (git-2c8fd42) Gallium 0.4, Compiler: GCC 4.9.2 + Clang 3.8.0 + LLVM 3.8.0svn, File-System: ext4, Screen Resolution: 2560x1600


Tesseract 2014-05-12
Resolution: 1920 x 1080
Frames Per Second > Higher Is Better
Catalyst 15.7 .......................... 189.28 |==============================
Mesa git-2c8fd42 AMDGPU + LLVM 3.8 SVN . 26.46  |====


Unigine Valley 1.0
Resolution: 1920 x 1080 - Mode: Fullscreen
Frames Per Second > Higher Is Better
Catalyst 15.7 .......................... 51.18 |===============================
Mesa git-2c8fd42 AMDGPU + LLVM 3.8 SVN . 12.18 |=======


Xonotic 0.8
Resolution: 1920 x 1080 - Effects Quality: High
Frames Per Second > Higher Is Better
Catalyst 15.7 .......................... 207.13 |==============================
Mesa git-2c8fd42 AMDGPU + LLVM 3.8 SVN . 44.29  |======


GpuTest 0.7.0
Test: Plot3D - Resolution: 1920 x 1080 - Mode: Fullscreen
Points > Higher Is Better
Catalyst 15.7 .......................... 55622 |===============================
Mesa git-2c8fd42 AMDGPU + LLVM 3.8 SVN . 6402  |====


GpuTest 0.7.0
Test: Triangle - Resolution: 1920 x 1080 - Mode: Fullscreen
Points > Higher Is Better
Catalyst 15.7 .......................... 211240 |==============================
Mesa git-2c8fd42 AMDGPU + LLVM 3.8 SVN . 16158  |==