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Those numbers are compared to an Intel Core 2 Extreme QX9770, the fastest quad-core CPU available today. In the worst case scenario, the GTX 280 is around 40% faster than encoding on Intel's fastest CPU alone.
RapiHD and thus BadaBOOM are both CUDA applications, meaning they are written in C and compiled to run on NVIDIA's GPUs. They won't work without a CUDA-enabled GPU (GeForce 8xxx, 9xxx or GTX 280/260) and they won't work on AMD/ATI hardware.
AnandTech: More Details on Elemental's GPU Accelerated H.264 Encoder