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No need to worry about pushing clocks high. You won't damage anything. Once you start adding voltage is when you need to worry.
Keep an eye on temps, though...especially if you installed the Twin Turbo by yourself. If not installed correctly you can get some pretty bad temps.
There is no pencil mod for the 8800GT. You have to solder in a variable resistor on that card due to the starting resistance.
Edit: I see the 8800GT mentioned in the 2nd post, but not in the 1st...is that what you have D3viLEyE?