Thanks for the explanation on how to install this Hybrid Physx. I followed it to the letter and have Metro LL working incredibly well with a 290X and GTS450 physx card. Though the writeup steps run into each other. Need to be cleaned up a bit. Anyhow this is what I did:
1. Installed the phyx card. No need to reinstall AMD drivers.
2. Ran PreHybridiz.
3. Ran 320.49 custom holding out on the physx drivers and gf experience. Installed all the other 3dvision drivers just to be safe.
4. Installed Physx 9.13.0725
5. Ran Hybridize as admin.
6. Ran openiz and cudafix as admin and rebooted.
7. moved cuda* and phyx* type files into a backup folder (were 4 files total).
8. Verified with Afterburner gpu utilization and could feel the difference!
This was all in a pretty recent install of Win 8.1 evaluation. Win 8.1 gives you a few fps more than win 7 fwiw..
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