how much of an upgrade is the 8600gt to 9600gt..?

it isnt

Think it was more of a case with getting the dual integrated GPU and dedicated GPU to show off.

Also, the whole 8600GT failing fiasco, least, hopefully, with the 9600GT this won't happen.

9600M GT = Overclocked 8600M GT with Stablility

no on macbook pro they are not slower.

think that they are new chips.

also for a search at wikipedia i found that

8600M GT is giving 114gflops
9400M GT is giving 120gflops

Compare please

8600 GT

Core clock: 540mhz
Shaders clock :1190mhz
Memory clock (real speed): 700mhz
Production: 114gflops

9600GT

Core clock: 500mhz
Shaders clock :1250mhz
Memory clock (real speed): 800mhz
Production: 120gflops
Mem. band. :25.6gb/s

Comments are yours.

I have no idea what you are trying to say.