Haisnu, I can some it up real quick for you "More power ugh ugh ugh" seriously, these company's play to consumer demand, because they want to sell their product. Most consumers want bigger tv's bigger display for comps. And while you are at it, make it faster. So they are making the chip smaller and faster, just the housing is getting bigger, as well as the displays. Unless you figure in laptops which are getting lighter and smaller , but the displays are getting bigger and better, so the cases are staying the same size. Again the consumer is driving what the product are.
dfi nfII ultr infinity/asus p4s800
amd 2500xp m/p4 2.6
ati 9600/ati 9600 pro
512mb pc3200/512mb pc3200