Windows 10 vs. Ubuntu Linux With Radeon / GeForce GPUs On The Latest 2018 Drivers
When firing up BioShock Infinite at 1080p, the Windows performance was much higher than the Linux OpenGL results with the exception of the GTX 1060 where the performance was about the same. Obviously BioShock Infinite at 1920 x 1080 isn't that demanding on today's modern graphics cards, but this combination was tested for a more CPU limited scenario. Here the RX 580 on Ubuntu got up to just 67% the speed of Windows or 52% on the RX Vega 64 while the GTX 1080 Ti crept up to 79%.
At 4K it ended up being quite a different story as in the more GPU-demanding situation, the performance on Linux was leading over Windows 10 in this particular game with the particular drivers/GPUs tested.
With CS:GO at 1080p it's another case of being CPU bound with today's GPUs, but is worth pointing out the NVIDIA Linux performance was faster than on Windows while the Radeon GPU performance with AMDGPU+RadeonSI remained lower than on Windows.
But when running Counter-Strike: Global Offensive at 4K, the results between operating systems were much closer. The RX 580 and GTX 1060 now nearly identical between Windows 10 and Ubuntu Linux while the RX Vega 64 remained much faster on Windows while the GTX 1080 Ti squeezed some extra frames out on Linux.