i think it would be more worthwhile if you buy a amd processor with as many cores(physical) as possible.

here is my set up

amd 8 core processor.. i can encode from 1080i to 360p at crf 23 x264 at around 200-250 fps. thats like a 100min movie gets encoded in 10mins.
i think your setup wont be THAT effective./or might take time to setup etc.