Has anyone wondered if RTX is possible on older engines like Acknex 8 Engine, which still uses DirectX 9?

Yes, this is possible through NVIDIA RTX Remix, which was created for Quake II, Portal and currently Half Life 2.
Getting started:
Runtime User Guide
Wiki
GitHub Remix
NVIDIA Omniverse (for USD Composer)
For support, join the RTX Remix Showcase discord (highly recommended!)

You can get some pretty good results this way, have fun!

To watch the videos, click on the images below.
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some settings changes...
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Regards, Robert

Quote
Everything should be made as simple as possible, but not one bit simpler.
by Albert Einstein

PhysX Preview of Cloth, Fluid and Soft Body

A8.47.1P