This white paper by Batty, Wiebe, and Houston of Frantic Films presents a GPU-based preconditioned conjugate gradient solver used in a production-quality fluid simulator. The paper shows a speedup of 50% over an equivalent CPU-based version, even though it is impossible to implement the optimal preconditioner on the current NVIDIA GPU architecture. (High Performance Production-Quality Fluid Simulation via NVIDIA’s Quadro FX. Chris Batty, Mark Wiebe, and Ben Houston. Frantic Films.)