NVIDIA has released the official version of PhysX runtimes. The new version 9.10.0129 seems to add the support of GF100 GPU:
Supports NVIDIA PhysX acceleration on all GeForce 8-series, 9-series, 100-series, 200-series, and 300-series GPUs with a minimum of 256MB dedicated graphics memory and 32 CUDA cores. Note: Some applications may have higher minimum requirements.
Anyway, you can download the version 9.10.0129 HERE.
Keep in mind that PhysX System Software does not require a GeForce 8/9/GTX200/GTX400 card. You can use PhysX runtimes even if you have a Radeon card. With a Radeon (and all non-GeForce 8+ cards like Intel or S3), PhysX will run in software mode.