Thought I'd also share the results from the new processor...
i7-3930K @ 4Ghz
Movie Maker only averaged 43% CPU usage & only used 9 of the 12 threads on the 3930k, but on the Phenom it's averaging 93% CPU usage & using all 6 available cores, so in theory, with 100% utilizaiton of all 12 cores on the 3930k??? 12 seconds???
So do you think that the 3930K's cores are more efficient than the Phenom's so they end up not needing 100% to do the rendering? Or is something else at play?
Considering the 3930K took longer, don't think it's efficiency related, but any thoughts I might have towards that end would be pure speculation. However, if I were in a speculating mood, I might speculate that Microsoft Movie Maker a) doesn't scale well past 6 cores b) has issues with X79 chipset or LGA 2011 processors c)disk access speed to low to utilize more than 8 cores effectively.
I can check out two of those: first I can setup a RAM drive for the file save to eliminate any possible write speed limitation. If that doesn't let Movie Maker run on all 12 cores, then I can disable HT so that there's only 6 cores for Microsoft Movie Maker to use & see if I then get similar results to the 1055t. If the first doesn't work & the second does then the issue is with Movie Maker itself i.e. poor scaling as core count increases. If neither works, then its likely a communication problem between Movie Maker & chipset or CPU, maybe a previously undetected bug in any of the 3.