Hello, and thanks in advance for your thoughts and your help. A question was brought up on the macrumors forums about the shortcomings of the 2006 mac pro. Basically someone said that he would not get a used 2006 mac pro because "it can't boot into Leopard in 64-bit." I asked him what he meant and he said that he didn't think it was "true" 64 bit because in his system info it says "64 bit kernel and extensions - no". I poked around a little bit and found a good article: RIGHT HERE detailing that Leopard runs on a 32 bit kernel, mainly because every extension must be 64 bit in order to run on a 64 bit kernel, and that Leopard can run 64 bit applications even though it runs on a 32 bit kernel. The article states that Snow Leopard will be the first operating system on a 64 bit kernel. Now, my question. Since my Mac Pro runs on 32 bit EFI instead of the new EFI 64, will I be able to have a similar 64 bit Snow Leopard experience? Will my EFI on my antique mac pro really limit the 64 bit Snow Leopard experience? Will my aluminum macbook be able to "do" more with snow leopard than my mac pro? and lastly, I am currently running the Radeon 4870 in my mac pro, since the guys at ATI snuck the 32 bit EFI onto the card as well as the 64 bit EFI, somehow. I wonder what's going to happen with all this when Snow Leopard drops. This question was brought up in a thread a few days ago and it got me thinking. I asked this question at the apple boards but have gotten no feedback. So, all of you smart folks, I look forward to your sage words on the matter.