Jumping onto Quad Core is probably future-proofing oneself and one would probably expect the benefits to fester as we move to Windows Vista. I tested out performance briefly on Windows Vista RC1 (v5600-16384). It seems Windows Movie Maker is better-tuned at multi-threading and publishing a movie through it shows a lot more CPU utilization on the QX6700.

QX6700 publishes my movie file 38% faster when I use the Windows Movie Maker, on Vista.

A very generic Processor benchmark provided on Windows Vista Accessment Tool.

QX6700 performs 5% better in this MicroSoft Benchmark Index.