i haven't been able to find a really clear answer on this, so hopefully someone will be able to answer this for me. i know the 970 uses more watts than the 970fx (which is in the new g5 lineup) but in terms of pure speed, are the new g5's faster than the older ones at the same clock speed. the reason i ask is because the dual 2.0 g5 with the 970 is sometimes on the special deals page on apple.com at $1999 which is less than my student discount for the newer lineup. also, are there any restrictions on the new dual 1.8 system compared to the old dual 1.8? i know you can only have a max of 4 gigs of ram with the new one, but are any other things different performance wise? thanks.