http://www.youtube.com/watch?v=YVil3GxavHg&fmt=22
Right now, I have to give PD7 of rating of: Use it for SD content only. It crashed 5 times before rendering the MP4 file (an hour wasted). And it could not deal with working with multiple AVCHD files. PD7 would crash and freeze for seconds at a time. And, this was with my cores never going above 50% usage - same thign for the RAM. Something about the programming in PD7 itself is a bottleneck.
I've been forcing myself to learn Vegas on the side and it does not have these problems. It's never crashed on me during a render and it does not get sluggish when working with multiple AVCHD files. I'm seriously done with PD7 now for HD projects. I can't deal with that again (an hour lost to crash after crash). I'm sure PD7 will get fixed up at some point though.