I'm purchasing a kit that comes with a 5900 RPM drive that I plan to use for the OS and applications.
I plan to to install two 7200 RPM SATA drives for capture and render. Will the speed of this OS HD have any negative impact on my AVCHD editing?
the rest of the system will be much like the post a couple of posts down, i7 950 3.0Ghz, 12 GB RAM, GTS 450 video card
Yes, but if the rest is setup properly it will not be much.