here is a review :
X1950PRO VS 7900GSATI Radeon X1950 Pro
Highs:
Best performance in the $199 category
Beats its market opponent in most of the gaming tests
36 pixel processors provide some reserve for future applications
Supports FSAA and FP16 HDR simultaneously
Supports VIVO
Supports hardware decoding of H.264 and other HD video formats
Effective and compact cooler
Quiet operation
Hardware CrossFire thanks to the integrated Compositing Engine
Lows:
Rather high power consumption
Long PCB may prevent installation into small system cases
Inconvenient position of the additional power connector
Nvidia GeForce 7900 GS
Highs:
High performance in OpenGL applications
Supports hardware decoding of H.264 and other HD video formats
Quiet operation
Low power consumption
Superb overclockability
Compact size (in comparison with Radeon X1950 XT/X1900 GT)
Lows:
Slower than the market opponent in a majority of benchmarks
Lower texture filtering quality than with the competing product
Does not support FSAA and HDR (FP16) simultaneously