CPUクロックは900MHZのまま、「Geometry Assist」をOFFにした状態でCPU OptimizationはAthlon,SoftwareT&Lで計測しました。
まずはAthlonでの結果です。

3DMark Result 3751 3D marks
CPU Speed 195 CPU 3D marks
Game 1 - Helicopter - Low Detail 79.31 FPS
Game 1 - Helicopter - Medium Detail 50.52 FPS
Game 1 - Helicopter - High Detail 19.42 FPS
Game 2 - Adventure - Low Detail 92.14 FPS
Game 2 - Adventure - Medium Detail 46.07 FPS
Game 2 - Adventure - High Detail 25.09 FPS
Fill Rate (Single-Texturing) 509.43 MTexels/s
Fill Rate (Multi-Texturing) 590.54 MTexels/s
High Polygon Count (1 Light) 3342 KTriangles/s
High Polygon Count (4 Lights) 3025 KTriangles/s
High Polygon Count (8 Lights) 2577 KTriangles/s
8MB Texture Rendering Speed 324.52 FPS
16MB Texture Rendering Speed 318.08 FPS
32MB Texture Rendering Speed 227.01 FPS
64MB Texture Rendering Speed 110.64 FPS
Bump Mapping (Emboss, 3-pass) 154.01 FPS
Bump Mapping (Emboss, 2-pass) 200.72 FPS
Bump Mapping (Emboss, 1-pass) 319.53 FPS
Bump Mapping (Environment) Not Supported

そしてSoftwareT&Lでの結果です

3DMark Result 3488 3D marks
CPU Speed 172 CPU 3D marks
Game 1 - Helicopter - Low Detail 71.79 FPS
Game 1 - Helicopter - Medium Detail 45.37 FPS
Game 1 - Helicopter - High Detail 16.56 FPS
Game 2 - Adventure - Low Detail 91.29 FPS
Game 2 - Adventure - Medium Detail 42.80 FPS
Game 2 - Adventure - High Detail 22.88 FPS
Fill Rate (Single-Texturing) 509.40 MTexels/s
Fill Rate (Multi-Texturing) 590.17 MTexels/s
High Polygon Count (1 Light) 3455 KTriangles/s
High Polygon Count (4 Lights) 2341 KTriangles/s
High Polygon Count (8 Lights) 1681 KTriangles/s
8MB Texture Rendering Speed 314.18 FPS
16MB Texture Rendering Speed 310.09 FPS
32MB Texture Rendering Speed 221.02 FPS
64MB Texture Rendering Speed 110.93 FPS
Bump Mapping (Emboss, 3-pass) 154.07 FPS
Bump Mapping (Emboss, 2-pass) 200.82 FPS
Bump Mapping (Emboss, 1-pass) 319.70 FPS
Bump Mapping (Environment) Not Supported

   (適当な)まとめ

1. Fill RateとBump Mapping はどの設定にしても変わらない
2. Geometry Assist に関わらずSoftwareT&Lでの結果はどの項目も変わらない
3. Geometry Assist ONのときのHardwareT&LではHigh Polygon Count (8 Lights)の値が
  他の結果と比べて大幅に高い

参考結果: 倍率変更でCPUを600MHZにして同じように計測

  Geometry Assist ON : 2836(HardwareT&L)  

  Geometry Assist OFF : 3130(Athlon)  2836(SoftwareT&L)