The 5000 series doesn't support PhysX WTF lol. This TANKS performance in older games that use it. Apparently, the solution is to pair the 5090 with a low-end 30 or 40 series card for getting PLAYABLE framerates in older games that use PhysX. In Mafia II, the 5090 gets less than 30 fps with PhysX maxed 
[URL unfurl="true"]https://www.xda-developers.com/redditor-physx-running-two-gpus/[/URL]
