Nope.

Over the weekend I switched from 2x 320g Seagate RAID0 to a 150gig Raptor and the faster access times certainly has made life quicker.

I also put in 4 1GB sticks of Crucial Ballistic PC2-8000 and they're working at 4-4-4-11 1T at stock speeds. So far so good, but I have a long way to go to see how much they'll last at 1T.