Nvidia's 50-series cards drop support for PhysX, impacting older games
Briefly

Nvidia's PhysX engine, once a significant feature in gaming, has encountered performance issues, particularly in games like The Witcher 3 and Borderlands 2. The technology, originally tied to 32-bit applications, is becoming obsolete with Nvidia's latest 50-series GPUs. As developers cannot create or debug 32-bit applications on the updated CUDA toolkit, users are forced to either retain older hardware for compatibility or face reduced performance and frame rates. While some games may still function with PhysX, the overall efficiency and usability have declined as technologies evolve.
Demanding Borderlands 2 keep using PhysX made it so it "runs terrible," noted one Redditor, even if the dust clouds and flapping cloth strips looked interesting.
Nvidia noted in mid-January that 32-bit applications cannot be developed or debugged on the latest versions of its CUDA toolkit. They will still run on cards before the 50 series.
Read at Ars Technica
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