The only thing the patch fixes for ATI cards is the SM4.0 issue.
Other than that, if you want better Physx performance your ONLY option is to get a new Nvidia graphics card or try to find an old Ageia PPU. ATI could do Physx, but ATI has chosen to not support this like Nvidia has, instead they are going with the Havok physics engine that was developed by Intel.
The Ageia PPU would be your best option as they are PCI and they should be found pretty cheap now a days...I got mine off of Craigslist for a measly $30...and I can confirm from first hand experience that the Ageia PPU is more than enough to handle to Physx inn Cryostasis...and does so quite well at that!
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