Phoronix has written a couple of interesting articles about how GPU performance under OpenGL/Linux has evolved over the last ten years, well I found them worth a read anyway.
Phoronix AMD article
Phoronix NVidia article
Edit: title doesn't make sense now I know there is an AMD article as well. opps

What's the best way to beat the winter blues? Benchmarking, of course! For starting off our 2016 of graphics card benchmarking under Linux, I've been working on a large round-up of re-testing AMD Radeon graphics cards from the HD 2900XT (R600) graphics card through the latest R9 Fury (Fiji) graphics card while running Ubuntu and using the very latest open-source graphics driver stack. Here's an interesting look at how the OpenGL graphics performance has evolved on the AMD side over the past decade while also looking at the performance-per-Watt.
Phoronix AMD article
Curious how the raw OpenGL performance and power efficiency has improved going back a decade to the GeForce 8 days? In this article is a 27-way graphics card comparison testing graphics cards from each generation going from the GeForce 8 series through the GeForce GTX 900 series and ending with the $999 GeForce GTX TITAN X. If you are interested in how graphics card performance has evolved, this is a fun must-read article.
Phoronix NVidia article
Edit: title doesn't make sense now I know there is an AMD article as well. opps
