open-source coders reach out to Nvidia to over uncovered bug

The developers of the open-source PlayStation 3 emulator RPCS3 are celebrating finding a workaround for an Nvidia driver bug. The social media celebration stems from their testing showing that some PC configurations with Nvidia GPUs can enjoy up to 37% faster gaming performance. That’s more than a small wrinkle that’s been ironed out.

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We don’t know the exact nature of the Nvidia driver bug here, but the RPCS3 devs say that it bottlenecks the performance of their PS3 emulator. The first example cited provides two PC configurations running Red Dead Redemption in a scene featuring a paddle steamer. This is a popular ‘benchmarking’ scene focused on the Blackwater docks in the game, featuring relatively consistent camera paths and water effects.

RDR boat test

Configuration

Performance uplift

System 1

13900K + RTX 3080

20% FPS

System 2

9800X3D + RTX 5090

25% FPS

Those are very gratifying performance uplifts resulting from a driver bug workaround. Plenty of readers are probably more interested if the purported bug might also be bottlenecking native PC gaming performance. If it were, that would be a hugely significant find/workaround from the RPCS3 team, specifically ‘Yahfz.’ Please note that “AMD GPU drivers do not have this bug, thus seeing no change,” say the emulator developers.

Gran Turismo 5 ran 37% faster, used far less VRAM

Follow-up social media postings underline that RDR isn’t an outlier, and “most games are impacted” by the bottleneck in the Nvidia driver. Great frame rate improvements can also be seen when using lower-end GPUs, too. The open sourcerers tested Gran Turismo 5 and saw frame rates climb by an incredible 37%, while VRAM usage dropped from 7.1 to 4.8GB. Meanwhile, playing Saints Row IV on a more mainstream GTX 1060 saw a 20% improvement in performance.

Sadly, RPCS3 dev reach-outs to Nvidia are falling on deaf ears. Another follow-up tweet states that “We tried using the developer forums in the past to no avail and gave up.” It then asks @Nvidia to establish a direct communication channel to receive driver bug reports. Nvidia Software QA boss Manuel Guzman has now replied directly, so we will see what happens in due course.