To gather OpenGL numbers for Doom, we kept our graphics settings identical and flipped over to the OpenGL 4.5 renderer. You can switch between our Vulkan and OpenGL results by clicking the buttons beneath the graphs for easy comparison.
The conventional wisdom among enthusiasts is that Nvidia's OpenGL driver is superior to AMD's, and our numbers bear that out. Switching to Doom's OpenGL 4.5 renderer puts the GeForce GTX 950 on top of our average FPS measures, but only by about a 10% margin. The GTX 950's 55-FPS average is practically identical to its performance in Vulkan, though, while the RX 460 loses a whopping 30% of its performance potential from the API change.
The other Radeons are similarly kneecapped by this move, and the R7 360 moves from "playable" to "marginal" thanks to its low average FPS and outsized 99th-percentile frame time. Stick with Doom's Vulkan renderer if you own a Radeon. This game wants to move fast, and 30 FPS just doesn't cut it.
Here's one instance where our measures of badness really show off their importance. The Radeon R7 360 struggles with frames that would drop frame rates below 30 FPS for over three seconds, compared to about one-tenth of a second with Vulkan enabled. All of our contenders struggle much more with frames that take more than 16.7 ms to render under OpenGL than they do with Vulkan, too. While Doom isn't unpleasant to play under OpenGL, it's just that much better with Vulkan enabled, and our numbers prove it.
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