I bought a pny 6200 hoping to get one that could be unlocked into a 6600. To my disapointment i got the 64 bit version and i wasnt impressed by the performance in the latest games, high resolutions are simply not possible. It wasnt long after i ditched it and got a 9700 which im more than happy with for now.
Obviously if you do buy one and get 128bit version then it will be a different story.
Thanks
Sean.