Q: where is the graphic performace switch?

thank you, i know but there is not option in my panel

Maybe i found the problem, yesterday i change my broken graphic card, nvidia 8600m gt 128m, now i see nvidia 8600m gt 64m, i already call the store that repair it asking for replace with a 128m, can be this the reason?

So the graphic card is arrived, my Mac Book Pro 2008 now is perfect but i still don't see the switching performance checkbox, I'm super happy and I want say a very big THANK YOU to the Taiwanese guys that repair it (just change the INVIDIA with a new one for less than 150$) and also say I'm very DISAPPOINTED by the Apple Assistence in Taiwan (Tainan), they take my computer to the inside laboratory, make a test and say that is garbage and i must throw it.

Thanks Lanny, i see, so the option disappear when you have the second monitor connected, i think we can close this issue.