1 rank in any knowledge skill gives you a +33 modifier. You get at least 34 skill points per level. Basically, you know everything about any academic subject that you've done minimal study about. You can also instantly deduce anything that can be deduced from a bunch of information.
Imagine reading "Windows XP for Dummies" and a couple of web pages on C++ one evening, and building Windows XP from scratch during the following month (basically, the time it takes to type it in, very fast; you will not make any mistake and it will compile and run perfectly on the first try. Hell, forget compiling, you could write it in machine language).
Imagine casually leafing through the first ten pages of the most complex detective story, and ten years later saying who the killer was.
Imagine reading a couple of issues of a pop science mag, and thinking up the entirety of relativity and quantum mechanics before dinner.
Imagine knowing mathemathics. All of it. Since three days or so after birth, I guess. You still can't make simple calculations faster than a computer (when it comes to sheer speed, there's only so much a biological brain can do), but you don't need to, because you can find the analytical solution to any problem.
A 74 Intelligence is so high that you could probably emulate having a fairly decent Charisma as well, simply because you know everything about psychology and you can deduce from past reactions what is most likely to make people happy.
However, since you actually have a normal Wisdom and Charisma, you would probably go insane. I am a fairly intelligent person, and I sometimes feel Black Mage-style burning rage at the general idiocy of humanity (especially while reading a newspaper); I don't even want to imagine what that feeling would be if I had that kind of intelligence. It would be something like being surrounded by monkeys, all the time. Even worse, monkeys that you are supposed to respect as fellow human beings. Madness is certain. Then again, being hyperintelligent the character may find some way to avoid this.