I have made 3 tests.
This one at my Intel Core 2 Duo E6700 running at standard clock with 2,67 GHZ:
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X3 - Terran Conflict
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Game Version: 1.2.0.0
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.080814-1233)
DirectX Version: DirectX 9.0c (4.09.0000.0904)
Graphics Card Info: NVIDIA GeForce 8800 GT [512 MB] Driver: 6.14.0011.7519
CPU Info: Intel(R) Core(TM)2 CPU 6700 @ 2.66GHz (2 CPUs)
Usable System Memory: 2046 MB
Video Settings During Benchmark:
Screen Resolution: 1024 x 768 * [32], fullscreen
Using Shader Profile: 3.0
Antialias Mode: 4x
Anisotropic Mode: 8x
Graphics & Shader Settings:
Texture Quality: high
Shader Quality: high
High Quality Bumpmaps: enabled
Environment Mapping: enabled
Glow Filter: enabled
Ship Color Variations: disabled
More Dynamic Lights: disabled
Used Vertexsize: 40 bytes
Framerates
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Scene "Trade" 32.7 average fps 10.0 minimum fps 67.0 maximum fps
Scene "Fight" 67.6 average fps 23.0 minimum fps 180.0 maximum fps
Scene "Build" 74.0 average fps 45.0 minimum fps 122.0 maximum fps
Scene "Think" 28.6 average fps 18.0 minimum fps 51.0 maximum fps
Overall average framerate: 50.7 fps
This time I overclocked the CPU to 3,25 GHZ:
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X3 - Terran Conflict
--------------------------
Game Version: 1.2.0.0
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.080814-1233)
DirectX Version: DirectX 9.0c (4.09.0000.0904)
Graphics Card Info: NVIDIA GeForce 8800 GT [512 MB] Driver: 6.14.0011.7519
CPU Info: Intel(R) Core(TM)2 CPU 6700 @ 2.66GHz (2 CPUs)
Usable System Memory: 2046 MB
Video Settings During Benchmark:
Screen Resolution: 1024 x 768 * [32], fullscreen
Using Shader Profile: 3.0
Antialias Mode: 4x
Anisotropic Mode: 8x
Graphics & Shader Settings:
Texture Quality: high
Shader Quality: high
High Quality Bumpmaps: enabled
Environment Mapping: enabled
Glow Filter: enabled
Ship Color Variations: disabled
More Dynamic Lights: disabled
Used Vertexsize: 40 bytes
Framerates
--------------------------------------------------------------------------------
Scene "Trade" 37.9 average fps 12.0 minimum fps 76.0 maximum fps
Scene "Fight" 78.2 average fps 27.0 minimum fps 207.0 maximum fps
Scene "Build" 79.2 average fps 47.0 minimum fps 122.0 maximum fps
Scene "Think" 29.7 average fps 19.0 minimum fps 55.0 maximum fps
Overall average framerate: 56.2 fps
Now I used the same clock speed, but I changed the res to 1600x1200:
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X3 - Terran Conflict
--------------------------
Game Version: 1.2.0.0
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.080814-1233)
DirectX Version: DirectX 9.0c (4.09.0000.0904)
Graphics Card Info: NVIDIA GeForce 8800 GT [512 MB] Driver: 6.14.0011.7519
CPU Info: Intel(R) Core(TM)2 CPU 6700 @ 2.66GHz (2 CPUs)
Usable System Memory: 2046 MB
Video Settings During Benchmark:
Screen Resolution: 1600 x 1200 * [32], fullscreen
Using Shader Profile: 3.0
Antialias Mode: 4x
Anisotropic Mode: 8x
Graphics & Shader Settings:
Texture Quality: high
Shader Quality: high
High Quality Bumpmaps: enabled
Environment Mapping: enabled
Glow Filter: enabled
Ship Color Variations: disabled
More Dynamic Lights: disabled
Used Vertexsize: 40 bytes
Framerates
--------------------------------------------------------------------------------
Scene "Trade" 35.6 average fps 12.0 minimum fps 75.0 maximum fps
Scene "Fight" 65.8 average fps 26.0 minimum fps 131.0 maximum fps
Scene "Build" 52.4 average fps 26.0 minimum fps 70.0 maximum fps
Scene "Think" 25.4 average fps 14.0 minimum fps 44.0 maximum fps
Overall average framerate: 44.8 fps
Very helpful in order to find out which components are really making THE difference, would be tests in which only one component has been changed (either CPU, RAM or graphic card)

Bye!