how can run linux (kernel and gui from ram)

[Jabka Atu <mashrom.head@gmail.com>]

Hello..
im going to buy a new pc with 4gb ram .
id like to run whole system from ram :
at boot that files will be cpd to ram disk and then the kernal will load
from ramdisk :
sevrel Question :
can i some how change loaded kernal path :
after boot remount it from other place.
will Kde (or Xfce ) run faster if i run it from mem? (no read/write
needed time).