Phoronix published a review on the 22-Way AMD+NVIDIA Graphics Card Tests With Metro Redux On Steam For Linux A quote from the article:

A few days back I wrote about being able to finally get the Metro Redux game benchmarks running in an automated manner under Linux to the point that we're now able to test it with the Phoronix Test Suite. With Metro 2033 Redux and Metro Last Light Redux now running well for our testing purposes, I've carried out performance tests of these two games with twenty-two AMD Radeon and NVIDIA GeForce graphics cards on Linux. Besides looking at the normal FPS result there's also frame latency metrics, power consumption data for each of these graphics cards, performance-per-Watt metrics, and GPU thermal results. If you're wondering what graphics card works best for your needs for OpenGL 4.x Linux gaming, here's an interesting look with the Metro Redux titles that premiered on Steam for Linux back in December.

 22-Way AMD+NVIDIA Graphics Card Tests With Metro Redux On Steam For Linux @ Phoronix