Building one impressive CUDA Cracking Server

This post details building and configuring a high-performance CUDA password-cracking server using four BFG Nvidia GTX 295 GPUs on an ASRock motherboard and Ubuntu 9.10 x64. It includes parts links and costs, power supply and case modification notes, cooling and airflow decisions, driver and CUDA SDK installation steps (including using nvidia-xconfig --enable-all-gpus), and performance claims (≈120,000 PMKs/s for WPA/WPA2 captures and ~2.3 billion attempts/s on a single GTX 295 with multiforcer, extrapolated to ~9.2 billion for four GPUs).