Here is benchmark for Mirror's Edge with Physx effects turned ON
Source
PCGH - Mirror's Edge benchmarks with Radeon HD 4870 plus Ageia card - Alternative to Nvidia Physx - Nvidia, Physx, Test, Benchmark, HD 4870, Ageia, Mirror's Edge, review
Source
PCGH - Mirror's Edge benchmarks with Radeon HD 4870 plus Ageia card - Alternative to Nvidia Physx - Nvidia, Physx, Test, Benchmark, HD 4870, Ageia, Mirror's Edge, review