Hi, reading about V5 environment variables I found something that looks interesting : SSTH3_2PPC_LOG2_BAND_HEIGHT (number of scan lines rendered by each texture unit when 2 pixel-per-clock rendering is enabled) and SSTH3_CBC (Triangle Iterations band. Added this keys to the registry and  make some benchmarks with 3D Mark, here are the results:

3D MARK 2000 build 335:

1024x768x32, Texture Format: 32bits, Z-Buffer: 24bits, Frame Buffer: Triple, CPU Optimization: PIII Optimization

1 Scan Line, 4 Iteration Columns:
253,6 MTexels/s (S. Texturing)
468,4 MTexels/S (M. Texturing)

1 Scan Line, 8 Iteration Columns:  (Driver Default Settings)
274,2 MTexels/s (S. Texturing)
502,2 MTexels/S (M. Texturing)

1 Scan Line, 16 Iteration Columns:
288,6 MTexels/s (S. Texturing)
524,3 MTexels/S (M. Texturing)

1 Scan Line, 32 Iteration Columns:
296,7 MTexels/s (S. Texturing)
540,0 MTexels/S (M. Texturing)

64 Scan Line, 32 Iteration Columns:
311,0 MTexels/s (S. Texturing)
572,9 MTexels/S (M. Texturing)

128 Scan Line, 32 Iteration Columns:
311,0 MTexels/s (S. Texturing)
572,9 MTexels/S (M. Texturing)



3D MARK 2001 SE:

1024x768x32, Frame Buffer: Triple, Z-Buffer: 24bits, Texture Format: Compressed

1 Scan Line, 4 Iteration Columns:
316,9 MTexels/s (S. Texturing)
578,0 MTexels/S (M. Texturing)

1 Scan Line, 8 Iteration Columns:   (Driver Default Settings)
326,0 MTexels/s (S. Texturing)
578,0 MTexels/S (M. Texturing)

1 Scan Line, 16 Iteration Columns:
329,4 MTexels/s (S. Texturing)
577,4 MTexels/S (M. Texturing)

1 Scan Line, 32 Iteration Columns:
331,4 MTexels/s (S. Texturing)
577,4 MTexels/S (M. Texturing)

64 Scan Line, 32 Iteration Columns:
332,4 MTexels/s (S. Texturing)
581,4 MTexels/S (M. Texturing)

128 Scan Line, 32 Iteration Columns:
332,7 MTexels/s (S. Texturing)
581,9 MTexels/S (M. Texturing)


There's a little boost, more noticeable in 16 Bit mode. Maybe it's useless, or all you already know it. Anyway.

Oooooooops!! I Almost forgot, my PC is PIII 900 MHz, 512 MB ram, Voodoo5 5500 AGP.

This are the keys I wrote for it to work with 3Dfx tools:

Triangle Iterations Columns:

Control: Combo
Default: 1
List: 4 Columns,8 Columns,16 Columns,32 Columns
Tweak Map: 3,0,1,2
Tweak Value: SSTH3_CBC
Value: 3

Scan Lines Rendering:

Control: Combo
Default: 0
List: 1 Line,2 Lines,4 Lines,8 Lines,16 Lines,32 Lines,64 Lines,128 Lines
Tweak Map: 0,1,2,3,4,5,6,7
Tweak Value: SSTH3_2PPC_LOG2_BAND_HEIGHT
Value: 7