I get this on a gt6600 (hope this helps you)
Color red bits: 5 Color green bits: 6 Color blue bits: 5 Color alpha bits: 0 Depth bits: 24 Stencil bits: 0 Accum red bits: 16 Accum green bits: 16 Accum blue bits: 16 Accum alpha bits: 16 Double buffering supported?: 1 Stereo left/right buffers supported?: 0 Auxiliary buffers available?: 4 Maximum pixel-remap table size: 65536 Maximum texture size: 4096x4096 GraphicsWidth(): 640 GraphicsHeight(): 480 GraphicsDepth(): 16 GraphicsHertz(): 60