Performance in Synthetic Benchmarks
3DMark05 obviously cannot be a truthful measure of performance of modern graphics cards. This benchmark runs at 1024x768 without FSAA and anisotropic filtering, so the result can be limited by the CPU performance. Moreover, it doesn’t use SM3.0, let alone SM4.0.
The individual tests are closer to real-life applications. We can’t see any difference between the Nvidia GeForce 8800 GTS 512MB and the ECS N8800GT-512MX DT: these tests cannot use up all of a modern GPU’s computing resources while the memory bandwidth is nearly identical for both cards.