Last set of question for Windows 7 install

A couple of final questions.

#1. I have a WD 74 GB Raptor drive which will be used as the primary op sys drive. I have a mb which has a set of 6 SATA 1.5 GB/s ports and 2 SATA 3.0 GB/s ports. The main hd is plugged in to SATA 0 of the 1.5 GB/s ports (since it can't utilize the bandwidth of the 3.0s). I also have 2 other drives which are plugged in to the two 3.0 ports. When I start the windows installation it lists the data drives as Drive 0 and 1, and the Raptor as drive 2. Is there any problem with selecting the Raptor (drive 2) as the Windows installation? Will that lead to anything funky down the road when it comes to program installs or will it still just label it as the C: and all is well?

#2. The Raptor drive is SATA but it also has a standard molex power plug in it as well. Can it run off of either power source or does it need to have BOTH power sources plugged in since it is a 10,000 rpm drive?