ive had both a 9600 pro and a 9800 pro, there isnt any way to clock a 9600 pro to 9800 speeds , they are two different animals, the 9600 only has a 128 bit memory bus VS the 9800's 256 bit. if i remember right the 9600 has a higher clock speed, on the core ,than the 9800 right out of the box. My 9600 clocked like a banshee able to get 570 on the core and 350 on the memory from stock 400/300, 9800 pro speed are 380/340. Now compare the rendering pipes the 9600 pro has only 4 pipes VS the 9800pro's 8pipes....huge difference. It would have to be one hell of a tweak to get a 9600 to 9800 speeds . fwiw
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EDIT maybe you were thinking 9500 to 9700?? that was possible with some of the 9500's but ati learned their lesson after that ..........