This is my first mac purchase after waitng for a long time so please understand. My new 2.7 pm is arriving tommorow, I already have an extra 2 gig of ram and ati x800 waiting to be installed. Should I install these things when I get the PM right out of the box or is it better to run, register etc. and then put in the extra ram and video card? Also, are there any simple tests to see how much difference has been made after adding the new parts?