Doom likes to run fast, and especially so with a GTX 1080 pushing pixels. The game's OpenGL mode is an ideal test of each CPU's ability to keep that beast of a graphics card fed. We cranked up all of its eye candy at 1920x1080 and went to work with our usual test run in the beginning of the Foundry level.
Doom's OpenGL renderer demands plenty of single-core throughput to keep frame rates high and 99th-percentile frame rates low. While Intel's menagerie achieves higher frame rates and lower 99th-percentile frame times than the Ryzen chips here, it's worth noting that all of the CPUs but the FX-8370 here are rarely dipping below about 83 FPS. That's still a plenty smooth and playable Doom experience. Still, this first gaming test puts a point on the fact that even with all of their generational improvements, Ryzen CPUs don't have quite the same IPC oomph as Intel's latest architectures.
These "time spent beyond X" graphs are meant to show "badness," those instances where animation may be less than fluid—or at least less than perfect. The formulas behind these graphs add up the amount of time the GTX 1080 spends beyond certain frame-time thresholds, each with an important implication for gaming smoothness. The 50-ms threshold is the most notable one, since it corresponds to a 20-FPS average. We figure if you're not rendering any faster than 20 FPS, even for a moment, then the user is likely to perceive a slowdown. 33 ms correlates to 30 FPS or a 30Hz refresh rate. Go beyond that with vsync on, and you're into the bad voodoo of quantization slowdowns. 16.7 ms correlates to 60 FPS, that golden mark that we'd like to achieve (or surpass) for each and every frame. And 8.3 ms corresponds to 120 FPS, an even more demanding standard that Doom can easily meet or surpass on hardware that's up to the task.
None of the CPUs we tested have more than a trace of frames that would drop frame rates below 60 FPS, so it's worth clicking over to the more demanding 8.3-ms plot to see what's happening. There, we can see that the Ryzen CPUs spend about as much time churning on tough frames that would drop animation below 120 FPS as Intel's Sandy Bridge and Ivy Bridge CPUs do.
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