hi i have a powerbook g4 titanium 550mhz processor with a 10gb hard drive. i only have 512mb of ram. i am running tiger 10.4.11 it runs kinda slow and i cant even watch movies or youtube videos without lag. all i want is to be able to watch videos and play halo. i plan on upgrading to 1gb of ram and getting a 160gb harddrive. i know that you need a 867mhz powerpc g4 processor. but i was wondering if anybody knew if it would run good on my 550mhz processor with 1gb of ram. i also was wondering if i upgrade my ram and hard drive if my computer will be able to play videos and movies with no lag. and be able to play halo or counter strike with no lag. PLEASE HELP.