Yes your right this test uses no shaders or other fancy filtering, it's just measuring pure polygon pushing power.
8600GT 3600 AMD 64 x2 = 169-347-712
7600GS 3800 AMD 64 x2 = 177-316-694
Your systems are very close in terms of power. With Nvidia cards the 1st number indicates the Shader GPU version, the numbers and letters after that the speed.
I nearly died laughing at your screenshot.
People save as .jpg plx not .bmp it's a huge file.
DinoHunter (still no nVidia compo voucher!), CPU/GPU Benchmark, DarkFish Encryption DLL, War MMOG (WIP), 3D Model Viewer