Nvidia 8600 - is there a risk of buying MPB 2.4?

I have a good offer to buy used MPB 2.4 (MacBookPro 3,1) produced at week 23 of 2007. I know it has potentially risky GPU chip 8600. A friend of mine who was using this machine less than two years never run games, he never yet experienced death screen. He used MPB basically for Lightroom, FCP and Photoshop. Same do I.
I know it's maybe risky to buy such machine especially keeping in mind that 2 years of replacement-for-free will end somewhere in this summer, anyway I have few questions:
1. Does all this situation with faulty NVIDIA chip mean that GPU will fail one day, anyway, earlier or sooner? Is this fail permanent, or rather spontaneous and depends on temporary heating = intensive tasks?
2. Does it definitely related on gaming, which use GPU, or not? Does Adobe applications or Apple's Pro apps use GPU as much intensively as games?
3. Does fans setting to turn earlier helps to prevent overheating?
Thank you.

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Hi All,
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