Try the RivaTuner 2.0 RC 15.2 !
One of the many new features:
"Now the NVStrap driver configuration tab contains "Allow enabling masked units" option, allowing the driver to force the graphics processor to activate all pixel / vertex units, even if they are hardware strapped as damaged. Please be extremely careful and use this option at your own risk. Enabling hardware masked units, which have not passed hardware quality testing, may cause unpredictable results and even permanently damage your graphics hardware."
Unwinder is truely amazing !