Noise Ninja 2.0
One of the great things about Noise Ninja is that it’s noise-removing algorithm is designed for multiprocessor systems. While other software such as Neat Image support multiprocessor systems, all they’re really doing is running multiple files simultaneously. That is, with Noise Ninja, all CPUs are used when cleaning an image. With NeatImage, each CPU focuses on its own image.
Time to Process an ISO 800 Canon EOS-20D – 8 threads (shorter is better)

Time to Process an ISO 800 Canon EOS-20D – 4 threads (shorter is better)

Time to Process an ISO 800 Canon EOS-20D – 2 threads (shorter is better)

Time to Process an ISO 800 Canon EOS-20D – 1 thread (shorter is better)

It’s interesting to see how the different threads affect different CPUs. On the slower Opteron 246, the fastest results were had with 4 threads, but on the faster CPUs, 8 threads was better.