No, I don't think so, but I guess there is an extreme where the chips would freeze, but you can use liquid oxygen cooling on a CPU for example
Well put it this way, adding 10 fans wouldn't do much anyway. Its all about air flow when you see when your talking about a computer case, and 10 fans positioned in back, front, and side, they'd force each other out and so less air would escape the case, and so, it'd actually end up hotter than with just a few. So you have to be careful with positioning