The AGEIA PhysX 100 Series PCI Express Card is a dedicated physics processing unit (PPU) developed by AGEIA Technologies. It was designed to offload physics calculations from the CPU to the GPU, enhancing the performance of physics-heavy games and simulations. This card was especially popular around the mid-2000s when AGEIA was an independent company before being acquired by NVIDIA. The card was used to accelerate real-time physics simulations, including things like fluid dynamics, object interactions, and environmental destruction, which were demanding on the CPU at the time.