Ok, im ordering a Mac Pro within the next few hours (5). I am going to upgrade the video card to the X1900. I would still like to know if this is worth it? As well as if the noise will be a lot different. Another thing im wondering about is apple care. Will it be void if I add aftermarket hardware? Is it a good idea to get this with a desktop? As well can someone explain to me the difference between 32bit and 64 bit and what it means for me? Any other info that you think might be useful is more than welcome. Thank you