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Rise of the Tomb Raider (DX12)
Since we already needed to go back and retest Rise of the Tomb Raider, we decided to deploy our brand-new Inside the Second methods (as seen in our Radeon RX 460 review) to gather some DX12 data with these more powerful cards for the heck of it. Aside from flipping on RoTR's DX12 mode, we kept settings identical to our DirectX 11 testing.

The switch to the DX12 API has practically no effect on these powerful graphics cards. The Radeon R9 380X does benefit from an improvement in its 99th-percentile frame time, but that figure itself isn't all that impressive for the Tonga part.

In our measures of "badness," the RX 470 spends almost five seconds of our one-minute test period working on frames that take longer than 16.7 ms to complete. That may be enough time spent churning to produce noticeable slowdowns and roughness in the course of Lara Croft's adventures. The RX 480 slashes that figure by 80%, so perhaps the RX 470's issues stem from the fact it's a fresh card with immature drivers. We'll have to see whether that's the case with time.