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SasqWatch
PC Games Hardware has put as variety of video cards through their paces with Risen:
More information.For the new developed Seamless World Streaming system a single Thread or ideally a single CPU core is responsible - during streaming the framerate drops for a short time only instead of heavy stuttering like in Gothic 3. According to the task manager Risen indeed uses the capacity of two cores most of the time. Sometimes even three during streaming. Nvidia's Physx Engine plays a role as well. It is used again but in the CPU instead of the GPU version.