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With all the comments in the 3dmark06 thread, i thought this might provide a nice talking point.
Game performance is initially examined with the test system running on a single-core CPU (Athlon 64 4000+) and a dual-core CPU (Athlon 64 X2 4800+). Note that the results are based on the highest quality in-game graphics settings using the GeForce 7800 GTX 512MB in SLI.
At a resolution of 1024x768, the dual-core Athlon 64 X2 4800+ outperformed the single-core 4000+ by an average of 14% in the seven games tested. The increased performance is likely attributed to the dual-core optimizations that NVIDIA's software engineers have been adding since ForceWare Release 75.