yep as a previous poster said those specs are more then enough to run any distribuion you want.
try out this distribution chooser, it asks a series of questions and gives you suggestions based on your answers.
Mandriva wont come with the drivers for your nvidia out of the box so you wont get 3d acceloration, however you will be able to use the computer graphically as normal just no 3d games.
This can be remedied by following this guide. Its extremely easy and well made. Gives it you step by step.
my suggestions for distributions to try are
PclinuxOS (rather then mandriva, its almost identical but does not suffer from the mandriva problems)
however you need to decide your self what you feel is good for you.