Nah... Well, if your making a laptop
I can tell your not exactly the computer expert (no offence). Its just that you wont need, or even see the difference between the two. Then again half the people here wouldnt either
Anyways, nah man, just get 830 and call it good. Because im sure that you want to use it stright outta the box, right? No Ocing and crap. Because you could go cheaper, and get the 820 and overclock a bit, and have it better then the 830, although, that would just be a hassle, and you would need to watch temperatures.
My suggestion goes for the 830 because its a nice processor, straight outta the box.