I'm looking on getting my first Mac, and, coming from a PC background, I'm used to building my own computers and upgrading them over time. Because of this, I have some really simple questions about upgrading the Mac Pro. Does it come with screws for additional hard drives and an additional optical drive? I generally buy these two OEM and use the screws that came with my tower. How do PCIe power cables work on the Mac Pro? From what I've gathered, there are two 6-pin PCIe power outlets on the motherboard. Does it come with the cables? Do the graphics upgrades come with the cables? How do new graphics drivers generally get distributed? With Windows, when I get a new graphics card, it runs with minimal graphics until I can install new drivers. I see that people who upgraded to an 8800 GT had trouble doing fresh OS X installations. This bothers me, because I know it's the first thing I'll want to do after recieving my computer and installing a 3870. What update of OS X can I expect to be on the installation disk I recieve. Does it depend on the retailer and when I buy it? Is there a way to know for sure? And finally, what about Boot Camp drivers? For graphics, are these just the generic Forceware and Catalyst drivers I can get at the NVIDIA and ATI websites, or are they special somehow? Also, can I just jump to the 2.1 drivers by downloading them or do I need to install whatever version comes on my Leopard disk first?