put this here being this is a mac question. and who knows it might shape into a security post

i recently purchased a macbook 1.83ghz gig ram 60gig hdd. love it.

i deffinitly dont have the cash to buy a desktop so im looking on ebay.
now what i cant grasp is.. the extreme jump in hardware.

a G4 450mhz?!
and now there are G5 with dual or quad cores!

did i miss a level or is there just a massive gap.

and i also ask. are macs able to do so much with so little raw power?
im not familiar with the PPC arc.

so these are my questions

are G4s a waste of money. if i get one will it be so slow it wont be worth it.

and 2
why the massive jump between speeds and hardware