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POV-Ray rendering
POV-Ray is the granddaddy of PC ray-tracing renderers, and it's not multithreaded in the least, because it's designed to be a cross-platform application. POV-Ray also relies more heavily on x87 FPU instructions to do its work, and it contains only minor SIMD optimizations.

POV-Ray loves the Athlon 64, and the 3500+ comes in just behind AMD's 2.4GHz chips.